"Iodine Test For Starch" Essays and Research Papers

Iodine Test For Starch

Proteins Purpose: To test for the presence of starches and protein macromolecules, to introduce the concept of variations in chemical compounds. Hypothesis: If biuret is blue after a test for protein, then it is a negative result because biuret reagent is blue to begin with. If a solution is pinkish purple, or purple, then the test for protein is positive. The test solution for starches is yellowish brown. If any substance that is yellowish brown when mixed with iodine, then the test for starches is...

Carbohydrate, Enzyme, Glucose 720  Words | 5  Pages

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The Iodine Test sor Starch

to use Iodine, Benedict and Biuret to test the reaction of the following 12 samples: 1% glucose, 0.3% glucose-1-phosphate, 1% maltose, honey, 1% sucrose, 1%lactose, 1% glycogen, 1% starch, protein, beer, distilled water and an unknown solution (test tube: 300). The iodine test for starch was to test how would starch reacted if we put iodine in it. The color of starch before the test was clear. The color of the iodine was brown. When you added iodine into starch, the result was the starch solution...

Amino acid, Carbohydrate, Enzyme 1630  Words | 8  Pages

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Iodine Test for Starch

Iodine Test for Starch Introduction and Hypothesis: In this experiment, we used iodine to test for starch in certain solutions. Iodine separates starch from polysaccharides, monosaccharides, and disaccharides. Starch is a curled polymer of glucose and iodine interacts with molecules, which changes the color of the molecules to a kind of black color. Iodine does not respond with carbohydrates that are not curled or coiled, thus the color stays yellowish brown. A black color result means that starch...

Carbohydrate, Color, Experiment 497  Words | 2  Pages

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Iodine-starch Clock Rxn

Lab : Iodine-starch Clock Reaction Pre-lab: Before the lab was conducted, the concentration of the Iodate ions to be in the mixture made by dissolving specific volumes of solution A with a constant concentration and water was calculated using the dissolution formula: C1V1 = C2V2 Sample Calculation 1: Concentration of the Iodate ions: For mixture 1: C2 = C1V1/ V2 = (0.020mol/L) x (0.003L)/(0.01L) = 0.006mol/L The same calculations were used in the calculating of the...

Calculation, Chemistry, Concentration 644  Words | 5  Pages

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1.Find THE AMOUNT OF REDUCING SUGARS AND STARCH IN YELLOE AND GREEN BANANAS by Using the Benedict's test nad Iodine test. Why the Benedict's solution should be used in excess.

compare the amount of reducing sugars and starch in yellow and green bananas. Introduction: Bananas are green in colour and taste flat but after they are harvested and stored for some days, they will turn yellow from green and become sweet. Hypothesis: The green banana tasted plain because it contained large amount of starch, while the yellow banana tasted sweet since it contained large amount of reducing sugars. Biological principles: Benedict's test for reducing sugar: Reducing sugars include...

Banana, Benedict's reagent, Blue 1085  Words | 6  Pages

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Saliva on Starch

Experiment 9. The action of saliva on starch Study the flow chart on p. 9.02 for a few minutes to gain an idea of the outline of the experiment. (a) Prepare a water bath by using a Bunsen burner to heat some water in a beaker on a tripod and gauze till it boils; then turn the flame down to keep the water just boiling. While waiting for the water to boil, carry on from (b). (b) Label eight test-tubes 1 - 8 and in tube 1 collect saliva as follows: (i) Thoroughly rinse the mouth with...

Boiling, Cooking, Enzyme 1107  Words | 6  Pages

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Digestion of Starch

Cynthia Vang Derrick 24 Title: Digestion of Starch Problem: Hypothesis: If synthetic saliva breaks down the cracker the most Then more of the cracker should be digested Because synthetic saliva contains amylase, and amylase helps break down complex carbohydrates. Interpretation: Data Table: The results of the iodine and Benedict’s tests for the Carbohydrate lab Test Tube contents and number Color of iodine test Color of Benedict’s test How much is present? 0= none 1= present How...

Carbohydrate, Digestion, Enzyme 886  Words | 4  Pages

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Lab 2 protein and starch

in it. If Iodine reagent is added to DI water, onion juice, and 1% sucrose the contents will remain yellowish because there is no starches in these items. If Iodine is added to 1% starch then the mixture will appear blackish because it contains starch. Materials & Methods Materials: Test tube rack 4-5 test tubes per test (8-10 total) Transfer pipet Protective glasses Di water Evaporated milk 50% egg white solution 1% sucrose solution 1% starch solution Onion juice Biuret reagent Iodine Methods:...

Carbohydrate, Color, Enzyme 441  Words | 2  Pages

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Food Test Lab

investigation, you will perform some simple laboratory tests to detect carbohydrates (glucose and starch), proteins and lipids in common foods. The tests you will be using are outlined below. Benedict’s Solution → tests for simple sugars (glucose, fructose) Place ~10 mL of the sample to be tested into a test tube, then add 6 drops of Benedict’s solution and swirl to mix. Place the test tube in a boiling water bath for 5 minutes. A positive test is indicated by the colour changing from blue to green...

Carbohydrate, Disaccharide, Glucose 459  Words | 2  Pages

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project on chemistry : study of digestion of starch by salivary amylase

Objectives of the Project Report The main objective of this chemistry project report is “To Study the digestion of starch by salivary amylase and effect of temperature and pH on it” and To study digestion of starch by saliva. To study the effect of temperature on the digestion of starch by saliva. To study the effect of pH on the salivary digestion of starch. Introduction Every health book insists on the chewing of food. The act of chewing stimulates the excretion of saliva. Saliva...

Amylase, Amylose, Digestion 754  Words | 3  Pages

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Food Tests Lab Report

Food Test 1: Test for Glucose – with Benedicts solution Benedicts solution is used to test for simple sugars, such as glucose. It is a clear blue solution of sodium and copper salts. In presence of simple sugars, the blue solution changes color to either green, yellow or brick-red, depending on the amount of sugar. Method 1) Mix smalls amount of each food sample (i.e., Egg lumen, cylindrical piece of potato tuber, bread crump and crisps) in different test tubes with distilled water to make a...

Carbohydrate, Glucose, Iodine 813  Words | 3  Pages

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the halogen group with an atomic number of 53. The name iodine is from a Greek word: ioediës, meaning violet or purple because of the elements vapor. The natural element was discovered in 1811 by a French man name Bernard Courtois approximately around the time when France was at war (Swain). In a time of horror and death, there was a shortage of wood ashes used for obtaining potassium nitrate. As an alternative source of potassium, big companies and manufacturers turned towards cheap soda...

Bernard Courtois, Chemical element, Chernobyl disaster 745  Words | 3  Pages

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Food Lab: Testing for Protein, Starch or Sugar

Title Food Lab Abstract The aim of this report is to see if the any of the four food apple sauce, carrot juice, cracker juice, and turkey juice contain protein, starch, or sugar. Between these four foods two are positive for sugar which are apple sauce and carrot juice. Sugar is an organic molecule of carbohydrate and so is starch. The starch was positive in two of the foods which are cracker juice and carrot juice. Protein is its own organic molecule and only one food tested positive for protein and...

Blue, Carbohydrate, Color 1058  Words | 4  Pages

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Amylase vs Starch vs Temp vs Buffers Lab Report

Amylase Enzyme vs. Starch vs. pH vs. Temperature Taylor Ellsworth Professor Michael Bunch Cell Biology 112 “Effects of Amylase reaction time when breaking down starch.” Experiment Goal: The goal of our experiment was to understand the similarities in digestion by finding out how long it takes for the amylase enzyme, found in saliva, to break down our substrate, starch. Hypothesis: While understanding that starch is broken down by our saliva (amylase enzyme) we predict that the higher...

Acid dissociation constant, Amylase, Borax 1165  Words | 4  Pages

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Qualitative Food Tests

Food Tests Aim: To test an unknown substance for various food substances. Apparatus/Materials: * Unknown Solution X * NaOH * Iodine * Ethanol * Copper Sulphate * Benedict’s Solution * HCl * Cold Water * Syringe * Beakers * Bunsen burner * Tripod stand * Test tubes * Dropper Introduction: This Lab shows the detection of different food sources using different tests. Some of the food tests carried out was Benedict’s test, the test...

Amino acid, Carbohydrates, Cellulose 1577  Words | 5  Pages

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Biochemical Tests

Specific Objective: Carry out test for reducing sugar, non reducing sugar, starch , protein and lipid. BIOCHEMICAL TESTS Reducing and non-Reducing Sugars Sugars can be classified as either reducing or non-reducing based on their ability to reduce copper(II) ions to copper (I) ions during the Benedict's Test. Reducing sugar have contain free aldehyde or ketone group and have the ability to reduce copper(II) ions to copper (I) ions during the Benedict's Test. All monosaccharides are reducing...

Benedict's reagent, Disaccharide, Fehling's solution 949  Words | 5  Pages

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Test to Determine the Presence of Reducing Sugars, Proteins, and Carbohydrates

Aim: To find out which samples consists of starch/ proteins/ reducing sugar/disaccharide out of 4 given samples A, B, C and D. Research Question: Out of the four given samples which sample consists of protein/ starch/reducing sugar/ disaccharide? What color changes will help to identify the contents of each sample when treated with iodine, biuret agent and benedicts solution? Theory and background information: What is a protein?1 Proteins are macromolecules, consisting of one or more chains...

Amino acid, Carbohydrate, Chemical tests 877  Words | 3  Pages

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Chemistry Project Report: To Study the Digestion of Starch by Salivary Amylase and Effect of pH and Temperature on it

the Digestion of Starch by Salivary Amylase and Effect of pH and Temperature on it   Submitted by : Class XII (CBSE) Sr. Sec. School     Contents 1. Certificate 2. Acknowledgement 3. Verification 4. Objectives of the Project 5. Introduction 6. Material Required 7. Procedure 8. Observation 9. Conclusion 10. Bibliography     Certificate This is to certify that the investigatory Chemistry project report entitled “To Study the digestion of starch by salivary amylase...

Amylase, Amylose, Digestion 950  Words | 5  Pages

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Starch Hydrolysis by Amylase

Experiment 2: Starch Hydrolysis by Amylase Theoretical Background Polymers of carbohydrates are called polysaccharides, and make up some of the most important naturally occurring compounds [1]. They have thousands of monosaccharide units linked to each other by oxygen bridges. They include starch, glycogen, and cellulose, all three of which yield only glucose when completely hydrolyzed [2]. A B Figure 1. Starch (amylose) (A) and cellulose (B) Starch occurs...

Acid dissociation constant, Amylase, Buffer solution 1389  Words | 6  Pages

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Digestion of Starch by the Action of Salivary Amylase

     CHEM 1021  BREAKING DOWN STARCH USING SALIVARY AMYLASE  Caution:    You  will  be  using  a  Bunsen  burner  and  glassware  to  create  your  own  constant  water  bath.   Appropriate  caution  should  be  exercised  when  dealing  with  the  Bunsen  burner,  hot  water,  and  glassware.  Purpose:  Many plants store their energy in the form of starch, a polysaccharide made from repeating  units of the monosaccharide glucose.  Our bodies break down starch into the individual glucose units...

Amylase, Amylopectin, Amylose 1528  Words | 4  Pages

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Lab Report for Food Test

known as ketoses.Glucose and galactose are example of aldoses while fructose is an example of ketoses.There are few test can be done for testing these sugar to show or prove are they reducing sugar or non reducing sugar.Example of the test that can be done is Benedict test. 1 In plant,glucose is stored as the polysaccharide starch.Example of food that rich in starch is oat,cereal,rice and corn.Starch can be divided into two groups which is that is amylose and amylopectin. Natural...

Carbohydrate, Fehling's solution, Fructose 1475  Words | 5  Pages

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Experimenting with Biological Macromolecules in Various Identification Tests

joined together by a covalent glycosidic bond to create more complex sugars such as disaccharides (2 monosaccharide’s), oligosaccharides (between three to ten monosaccharide’s) and polysaccharides (consists of several monosaccharide’s). (Karp, 2010) Starch is the most common nutritional polysaccharide, which consists of two polymers: amylose and amylopectin. Amylose is unbranched whereas amylopectin is branched. Structural polysaccharides consist of cellulose, which is a major component of plant cell...

Carbohydrate, DNA, Enzyme 2144  Words | 7  Pages

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Planning Coursework-Starch and Amylase

PLANNING COURSEWORK- STARCH AND AMYLASE AIM The aim of this coursework is to investigate the effect of temperature change, on the rate of hydrolysis of starch catalysed by amylase. PREDICTION I think that as the temperature increases, the rate of reaction also increases, to a point when it dramatically decreases. On graph 1, you will see a sketch of the graph which I expect to be the result of the experiment. SCIENCE REASONING I think my prediction is correct because the rate of...

Activation energy, Amylase, Catalysis 1747  Words | 7  Pages

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Biology Laboratory Tests

enzyme catalyst. Materials/Apparatus: Test tube, test tube racks, pipette, petri dish, hot water bath, forceps, cotton wools, knives, potatoes, distilled water, hydrogen peroxide of varying concentrations Method #1 Aim: Testing the effects of temperature on catalysed activity in potato. 1. Prepared a water bath of varying temperatures. 2. Placed a small piece of crushed potato in a clean test tube and covered it. 3. Prepared three (3) other test tubes in the same manner as in Step 2...

Benedict's reagent, Chlorine, Ethanol 1379  Words | 6  Pages

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Enzyme Kinetics Lab Report: The reaction rate of enzyme, '-amylase in Starch-Iodine solution at different temperatures and pH levels

reaction rate of an enzyme, '-amylase in starch-iodine solution. We will be testing the relationship between enzymatic reaction affected by temperature and pH. Through the testing the enzyme at different temperatures, and different pH levels; it would determine at which temperature and pH level the enzyme worked the most efficiently. Analyzing absorbance of the solutions with spectrophotometery will determine the reaction rate. To test the optimal pH, the starch and a buffer were combined at a specific...

Amylase, Catalysis, Chemical reaction 1987  Words | 6  Pages

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Iodine Isotopes are the atoms that have in their nucleus an atomic number corresponding to the chemical behavior of that element. Since isotopes have the same number of protons, they all have identical chemical behavior. But, however, since their neutron numbers are different the isotopes of the same element may have different radioactivity. An isotope that is radioactive is called a radioisotope like iodine, which is important in our health. In radioactivity, the nucleus of an unstable isotope...

Atom, Atomic number, Chemical element 988  Words | 3  Pages

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Testing for Reducing sugars, non-reducing sugars, starch, lipids and proteins.

non-reducing sugars, starch, lipids and proteins in unknown substances: Our aim: was to find out which substances from our five samples have reducing sugars present to determine what they may be for example; they could be monosacchrides or disaccharides. This was carried out by using Benedict’s test. To find out which substances from our five samples were non-reducing sugars, since some disaccharides are reducing sugars and this would be carried out by using Benedict’s test. To find out which...

Carbohydrate, Disaccharide, Fructose 1271  Words | 5  Pages

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Kinetics: Iodine Clock Reaction

rates You’ll be studying various aspects of kinetics of three reactions. A. Reaction between lead nitrate (PbNO3) and potassium chromate (K2CrO4) solutions B. Reaction between potassium permanganate (KMnO4) and oxalate ion (C2O42-) C. Iodine clock reaction A. REACTION BETWEEN LEAD NITRATE AND POTASSIUM CHROMATE SOLUTIONS Lead nitrate reacts with potassium chromate to form yellow lead chromate precipitate and aqueous potassium nitrate. The formation of a yellow precipitate indicates...

Chemical kinetics, Chemical reaction, Iodine 1159  Words | 5  Pages

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Starch and Dialysis Bag

came to the conclusion that as we learned in this module some molecules are too large to pass through membranes and some are some are small enough to pass through just about all of them. Introduction and Background: In this lab I determined whether Starch “Dialysis solution” or the IKI solution was able to pass through the dialysis bag. I also tested red and blue dye in a cornstarch filled petri dish. Each Dye had a different molecular weight and that played a part in their diffusion as well. My hypothesis...

Dialysis, Diffusion, Glucose 1262  Words | 7  Pages

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To Try to See If the Temperature Affects the Rate in Which Amylase Breaks Down Starch Into Maltose.

the rate in which Amylase breaks down starch into maltose. In this reaction starch is the substrate and maltose is the product. Amylase is an enzyme, Enzymes, also called catalysts, are in living things and there are thousand of them. Enzymes break down food by the active site on the Enzyme forming a chemical bond with a substrate and then water attacks the substrate until it is hydrolysed (split in 2). Equipment: Boiling tubes Timers/ stopwatch Starch Solution of Amylase – colourless ...

Amylase, Chemical reaction, Chemistry 1034  Words | 3  Pages

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Diagnostic Test for Bacillus: Ascoli's Thermo Precipitation Test

EXPERIMENT No.25BACILLUS: Diagnostic Tests | | ASCOLI’S THERMOPRECIPITIN TEST Purpose: used to identify anthrax bacilli in animal hides and meat. Principle: This test was designed to detect B. anthracis antigens in the tissues of animals being utilized in animal by-products and thereby to reveal when these products contained ingredients originating from animals that had died of anthrax. The thermostable antigens involved are common to other Bacillus species so the test depends on the fact that the...

Bacillaceae, Bacilli, Bacillus 1533  Words | 6  Pages

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Food Tests: To Study the Presence of Reducing Sugars and the Presence of Protein

Experiment 2: Food Tests Objective * To study the presence of reducing sugars. * To study the presence of protein. Introduction In this experiment, glucose, maltose, lactose and sucrose are used for testing reducing and non-reducing sugars. Glucose is monosaccharide while maltose, lactose and sucrose are disaccharides of carbohydrates. Monosaccharaides are the monomers which make up all other carbohydrates and cannot be broken into smaller molecules by hydrolysis. Disaccharides are...

Carbohydrate, Disaccharide, Enzyme 1570  Words | 6  Pages

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Experiment: To Test Food to See if They Contain Starch

To test for starch Aim: To test certain foods to see if they contain starch Materials: foods containing starch, iodine, potassium iodine, water, Benedict’s solution Equipment: test tubes, test tube racks, water baths (boiling), eye protection Method: 1) Two to three drops of the iodine were dropped in the potassium iodine solution to 2cm cube of the starch suspension. 2) Then a suspension was made up of the foods by mixing it with water. 3) Then two to three drops of the iodine was...

Carbohydrate, Glucose, Iodine 252  Words | 2  Pages

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Experiment for Starch

are recorded before and after staining, after observation under 10× and 40× power. Experiment Objection: I. Observation of starch grains under microscope (before and after staining) II. Observation of onion cells under microscope (before and after staining) III. Observation of cheek cells under microscope (before and after staining) Materials: * iodine, * methylene blue * a small piece of potato, * an onion * water Apparatus: * A light microscope *...

Biology, Eyepiece, Light 930  Words | 4  Pages

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Is Starch Permeable in Cells

“Is Starch Permeable in Cells? Abstract This report presents the weights of 3 samples of water with various amounts of solute after the use of osmosis. Three different tests were performed, each with a beaker of water containing varying amounts of starch from 30% concentration (12.5 grams of water) to 15% concentration (9.5 grams of water), and then 0% (10.5 grams of water). To start this experiment, we put water into a make-shift dialysis tube, a type of semi-permeable membrane tubing made...

Chemistry, Concentration, Dialysis tubing 1370  Words | 4  Pages

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Determination of Chlorine and Iodine in Water

of Chlorine and Iodine in Water I. Introduction The purpose of this laboratory was to determine the amount of chlorine and iodine in a sample of water by titration using a starch indicator and to standardize a sodium thiosulfate solution. Chlorine is added to municipal water supplies to purify it enough to become safe to drink. Iodine is also added to water when people camp or go hiking in the back country where they cannot bring purified water along. Chlorine and iodine are added to kill...

Acetic acid, Chlorine, Ethanol 1401  Words | 4  Pages

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Reaction Rates of Barley Alpha-Amylase Enzyme with Substrate Starch at Different Ph’s and Temperatures

alpha-amylase enzyme with starch substrate and establish the optimum temperature and pH for this reaction. The optimum temperature and pH for the reaction of alpha-amylase and starch was predicted to be a temperature of 50°C and a pH of 5. The optimum temperature and pH for the reaction was determined by monitoring the reaction rate of alpha-amylase at different temperatures and pH’s by means of using a spectrophotometer to measure the disappearance (in absorbance) of the substrate starch. As a result, the...

Amylase, Chemical reaction, Chemistry 2093  Words | 6  Pages

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Iodine Clock Reaction: Concentration Effect

the presence of small quantities of starch and sodium thiosulfate solutions. As the iodine molecules are produced they immediately react with the thiosulfate ions and are converted back to iodide ions: I2(aq) + 2S2O32⁻(aq) → 2I⁻(aq) + S4O62⁻(aq) During this period the reaction mixture remains colourless. But once the thiosulfate ions have been used up, a blue/black colour suddenly appears because the iodine molecules now get the chance to react with the starch. A series of experiments will be carried...

Chemical reaction, Chemistry, Iodine 1498  Words | 5  Pages

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Starch Lab

Biosynthesis of Starch Introduction: In this lab we learned the concept and procedure of synthesizing starch. We also learned the effects of pH and temperature on the reaction rates of amylase.. In the process of the synthesis lab we learned phosphorylation using a potato, which was what we synthesized. The phosphorylation took place after the addition of primer. There are two different types of starches used are amylose and amylopectin. To test for the presence of starch, the Starch Test is used....

Amylase, Amylopectin, Carbohydrate 399  Words | 2  Pages

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Lab Report on Starch In leaves

report Aim : To check the presence of starch in the leaves Hypothesis : the presence of starch can be detected if the specimen turns black blue after iodine solution. Materials : 1) Green leaves 2) Wire gauze 3) Iodine solution 4) Forceps 5) Specula 6) Bunsen’s burner 7) Test tube 8) Water 9) Tile 10) tripod stand 11) glass 12) slide 13) dropper 14) water 15) water bath Procedure: collect dark green leaves (as leaves contain starch) take a water bath and let it heat with...

Blue, Chlorophyll, Color 295  Words | 2  Pages

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Iodine Clock Reaction

of the initial rate of reaction. The trick, of course, is knowing when the fixed amount of product has been formed. The following examples illustrate how this can be done. Appearing blue There are a number of so called 'iodine clock' reactions in which molecular iodine is one of the products. Probably the most famous of these is the reaction involving hydrogen peroxide and iodide ions in acid solution: H2O2 + 2I– + 2H+ → I2 + 2H2O The kinetics of this reaction was first investigated...

Chemical kinetics, Chemical reaction, Chemistry 1364  Words | 5  Pages

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MTo Study The Digestion Of Starch

m To Study the Digestion of Starch by Salivary Amylase and Effect of pH and Temperature on it Theory Every health book insists on the chewing of food. The act of chewing stimulates the excretion of saliva. Saliva mixes up with the food and helps its digestion. That is, the enzyme ptyalin or amylase present in human saliva hydrolyse the big molecules of food into many molecules. For example starch into mono-saccharides maltose and glucose; proteins into amino acids and fats into fatty acids and glycerol...

Amylase, Digestion, Enzyme 512  Words | 3  Pages

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Prevalence of Iodine Deficiency Disorders

INTRODUCTION Iodine deficiency disorders are still very much prevalent in the world today. Two billion people, estimated by the WHO, still lack a sufficient level of iodine in their diets which leads to a range of disorders known as iodine deficiency disorders (IDD). So what is iodine? Iodine is an essential micronutrient in the diet which is used by the thyroid gland (located in the throat) to produce thyroid hormones which help control the body’s metabolism. The two most important thyroid...

Cretinism, Goitre, Hypothyroidism 2433  Words | 7  Pages

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812  Words | 6  Pages

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Starch Granules

Title: Starch Aims 1. To identify starch in food. 2. To study the microscopic appearances of raw and heated starch. 3. To compare the viscosity of various gelatinized starch solutions. Introduction Starch is one of the most abundant substances on the earth. It can be found in seeds, grains, and roots of many crops where it is synthesized in granular form. Starch granules are packages of starch molecules. The importance of starch is well-known, as is its central role in human diet....

Banana, Hydrogen bond, Iodine 2781  Words | 10  Pages

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Kinetics of the Reaction Between Acetone and Iodine

Experiment A1: Kinetics of the Reaction between Acetone and Iodine The key aim of this experiment was to determine the rate equation for the acid-catalysed iodination of acetone and to hence consider the insinuations of the mechanism of the rate equation obtained. The stoichiometric equation for the reaction between iodine and acetone is below, followed by the rate equation (where x,y,z and k are the values to be obtained): I2 + CH3COCH3 CH3COCH2I + HI -d[I2]/dt = k [I2]x [CH3COCH3]y [H+]z ...

Acetic acid, Chemical reaction, Erlenmeyer flask 651  Words | 3  Pages

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Chlorine and Starch Ts Assay

INDICATOR CHEMICAL REACTION Assay of Antimony potassium tartrate Direct titration 0.1 N Iodine Starch TS KOOCCHOHCHOHCOO (SbO) + I2 + H2O KOOCCHOHCHOHCOO (SbO2) + 2HI + 2HI + 2NaHCO3 2NaI + 2H2O + 2CO2 Assay of Strong iodine sol’n Direct titration 0.1 N Potassium arsenite Starch TS Assay of Methionine Residual titration 0.1 N Sodium thiosulfate Starch TS CH3SH – CH2CH2CH (NH2) COOH + I2 CH3---CH2 + 2HI ...

Acetic acid, Ammonia, Chlorine 498  Words | 5  Pages

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Amylases: Enzymes that Breakdown Starch

Amylases are enzymes that break down starch or glycogen. Amylases are produced by a variety of living organisms, ranging from bacteria to plants and humans. Bacteria and fungi secrete amylases to the outside of their cells to carry out extracellular digestion. When they have broken down the insoluble starch, the soluble end products such as (glucose or maltose) are absorbed into their cells. Amylases are classified based on how they break down starch molecules i. α-amylase (alpha-amylase)...

Amylase, Bacillus, Bacteria 695  Words | 3  Pages

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Dialysis of Starch

Dialysis of starch, glucose and sucrose Introduction: Research question: Does the dialysis tube only allow certain substances to pass through the pores because of their size? Dependent and Independent variables: Independent variables: The temperature of the classroom The size of the molecules The size of the pores in the tube The concentration of the indicators Dependent variables: The substance will either pass the pores of the tube or not The result will vary in darkness (color) Controlled...

Carbohydrate, Disaccharide, Experiment 693  Words | 2  Pages

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Protein and Result Starch Suspension

Test for Carbohydrates Result Starch suspension When the yellowish-brown iodine was added into the starch suspension, the starch suspension was changed into dark blue. Potato slide Discussion Starch suspension When the yellowish-brown iodine was added into the starch suspension, the starch suspension was changed into dark blue. This is due to the yellowish-brown iodine changed into dark blue when there is a presence of starch. This shows a positive test for...

Amino acid, Biochemistry, Primary structure 372  Words | 2  Pages

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Starch Experiment

Starch Experiment State the Problem: What foods or vegetables contain starch? Research the Problem: Before we start, we need to know more about starch. Studies show that starch is white, odorless, tasteless carbohydrate powder soluble in cold water. This information will help us extract starch from our samples for more accurate tests. If we have any colorful fruit or vegetables for test, we can eliminate the chance of mixed colors and inaccurate tests. Starch also plays a vital role in the...

Carbohydrate, Food, Fruit 295  Words | 2  Pages

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The Iodine Clock Reaction

Chemical Kinetics: The Iodine-Clock Reaction: S2O82−(aq) + 2 I−(aq) → I2(aq) + 2 SO42−(aq) To measure the rate of this reaction we must measure the rate of concentration change of one of the reactants or products. Here, it is convenient to carry out a clock reaction involving the product I2. To do this, you will include (to the reacting S2O82− and I−) i) a small (but accurately known) amount of sodium thiosulfate, Na2S2O3, and ii) some starch indicator. The added Na2S2O3 does not interfere with...

Activation energy, Arrhenius equation, Chemical kinetics 824  Words | 3  Pages

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Iodine Deficieny

Iodine deficiency is a major threat to the health and development of the world, predominantly among toddlers and pregnant women in low-income countries. It is a significant public health problem in 130 countries and affects 740 million people. An estimated one-third of the world's population is currently susceptible to the risk of iodine deficiency. Iodine is a vital nutrient for the proper functioning of the thyroid gland, which regulates growth and metabolism. Iodine deficiency is the primary cause...

Food, Goitre, Iodine 1039  Words | 3  Pages

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Analysis of Vitamin C I2 + Starch

(Woods) Analysis of Vitamin C I2 + starch - 1 - Vitamin C (ascorbic acid) was one of the first vitamins which established a relationship between a disease and its prevention by proper diet. Scurvy has been known for ages. Prevention of scurvy was prescribed by eating fresh vegetables and fruits. The active ingredient in fruits and vegetables that helps to prevent scurvy is ascorbic acid which primates, including humans, cannot synthesize. Ascorbic acid is an important biological antioxidant...

Antioxidant, Ascorbic acid, Collagen 944  Words | 5  Pages

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Starch Digestion Experiment

orange juice is held in a test subject’s mouth, the greater the ability of the test subject’s saliva will become to break down starches. Dependent Variable: pH of the saliva. Independent Variable: time that the juice is swished in the mouth. Controlled Variables: Orange juice only. The amount of orange juice tested must be the same for every trial. A 1% starch solution must be used in every test tube. Identical iodine solutions must be used to test the starch solution. The temperature...

Acid, Amylase, Blue 556  Words | 2  Pages

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Amylase Activity on Starch

The Effect and Rate of the Enzyme Amylase on Starch Abstract Assessing reaction speed of the enzyme amylase can be measured by the amount of glucose and maltose produced during given time intervals. I hypothesized that, if the reaction time is longer, then the amount of amylase will be larger. Enzymes are specific in their match of substrates they will breakdown – similar to a key and its lock. Since amylase is the only enzyme that breaks down starch, the procedure was effective and gave clear...

Amylase, Disaccharide, Enzyme 1270  Words | 4  Pages

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At leading companies, decisions once driven by HiPPOs (the Highest-Paid Person’s Opinion) are increasingly made by conducting experiments that draw on the core skills of statisticians. Rather than relying on gut instinct, businesses now find ways to test hypotheses and use statistical methods to analyze the results, applying the classic scientific method to decision-making. Big data promises big things—but only if we have people in place who know what to do with it. The United States has led the...

Data, Design of experiments, Economy of the United States 981  Words | 4  Pages

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burned and is hospitalized. She is now suffering from the acute tubular necrosis. Which is the most likely diagnosis> a- Prerenal b- Intrarenal c- Extrarenal d- Postrenal 20) 56 yr male presents with flank pain and polyuria. Tests reveal that he has an enlarged prostate. Which type is renal failure most likely to occur? a- Prerenal b- Intrarenal c- Extrarenal d- Postrenal 21) 60 yr male is diagnosed with renal failure. Which of the following lab values...

Bowman's capsule, Glomerulus, Kidney 846  Words | 5  Pages

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well, so well that the Deans nominated me for the Truman Scholarship, the Marshall Scholarship, and the Rhodes Scholarship. I didn’t get any of them, though, but the rejections came on super nice letterhead that still hasn’t yellowed. Standardized tests weren’t typically a problem, but the first time I took the LSAT, I threw up right before the exam, and so I scored somewhere in the neighborhood of a gifted fifth grader. Oh, I took more exams and I went to graduate school, but once I was there,...

Failure, Professor 2411  Words | 6  Pages

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Biruet Test

Biruiet Test: Procedure Instead of the Biuret Reagent, the following may be used: * Fehling’s Solutions A and B * Sodium hydroxide and copper (II) sulphate solutions 1. Add 2 cm3 of the liquid food sample* to a clean, dry test tube 2. Add 2 cm3 of Biuret Reagent. Alternatively: * Use sodium hydroxide solution and copper sulphate solution instead. Add 1 cm3 of sodium hydroxide solution (40% or bench solution) and 1% copper (II) sulphate solution dropwise – drop by drop - to...

Copper, Copper(I) oxide, Disaccharide 1200  Words | 4  Pages

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