different sections; we will be using the Biuret Test for amino groups present in proteins. The Iodine Test to identify the presence of starch. The Grease Spot Test and the Sudan Dye test to identify the presence of lipids (fatty acids). The Benedict’s Test to identify the presence of reducing sugars. In the biuret test if the test result for protein changes a color of lavender‚ purple or pink‚ the test result for protein is positive using the Biuret reagent. In the iodine test If the Iodine turns
Premium Benedict's reagent
is as follows: “(CH3CO)2O + HOC6H4COOH □(→┴yields ) CH3CO2C6H4CO2H + CH3COOH” (French et al‚ 82). Aspirin and salicylic acid have similar properties‚ but many choose aspirin for medicine because it is not as acidic as salicylic acid. The limiting reagent limits how much product can be synthesized. Once
Premium Stoichiometry Reagent Aspirin
Observing a Limiting Reactant An experiment was carried out to predict the limiting reactant in a chemical reaction between Magnesium and Hydrochloric acid‚ using the mole concept. Limiting Reactant: It is the reactant that will deplete or will be used up first during a chemical reaction. Limiting reactant also determine how long the reaction will last for. Balanced Equation: Mg + 2HCl = MgCl2 + H2 The balanced equation is needed to determine the mole ratio between the two reactants. From
Premium Chemical reaction Chlorine Magnesium
Lindsey Stockton. 3/2/2013. Section 16093. Determination of % by mass of NaCO3 in Alka-Seltzer Tablets Alka-Seltzer is an effervescent antacid typically used for pain relief and neutralizing stomach acid to alleviate indigestion. Alka-Seltzer tablets contain Aspirin‚ Citric Acid (CH3COOH)‚ and Sodium Bicarbonate (NaCO3). When the tablet is placed in water it undergoes an acid-base reaction and Carbon Dioxide (CO2) is a byproduct that causes the notorious “Fizz”. The objective of the lab
Premium Acid Carbon dioxide Reagent
Julie Nguyen Equilibrium Lab 4-28-14 I. Purpose To study the affect of temperature & concentration changes on systems in equilibrium II. Safety Wear apron Wear goggles Do not spill chemicals Clean up after use Wash hands Chemicals are TOXIC (by Britney Spears) III. Procedure A. Iron-thiocyanate equilibrium Pipet .3mL of 1 M iron (III) nitrate and .3 mL of 1 M ammonium thiocyanate. into clean 250 mL beaker. Add 75 mL of DS water. Mix well. Divide the solution into equal
Free Hydrochloric acid Sodium chloride Chemistry
3 Mass of dry product 0.9 g 2.00 3.00 Calculations 1. Determine the limiting reagent for each trial. Show your calculations. (Hint: See the example in the Introduction.) Example: Trial 1: Note: These should be about the same and either CaCl2 or K2CO3 can be the limiting reagent depending on their initial masses. Trial 2: Table 3: Comparison of theoretical and actual yields for CaCO3 Trial # Limiting Reagent Theoretical Yield of CaCO3 Actual Yield of CaCO3 % Yield Trial 1
Premium Reagent Stoichiometry Calcium
Lab #3: Stoichiometry of a Precipitation Reaction October 14‚ 2014 Abstract: The purpose of the lab‚ Stoichiometry of a Precipitation Reaction‚ is to be able to calculate the amount of a second reactant we need to react with the reactant one. You must calculate the amount of the second reactant using stoichiometry to figure out what amount is needed. After the amount is calculated‚ you then can add it to the first reactant and it will give you a full reaction. To figure out what you
Premium Stoichiometry Reagent Yield
Variable) | 1 Pipet‚ Graduated Jumbo (5 mL)(Dependent Variable) | 1 Distilled Water(Independent Variable) | 1 Potato(Independent Variable) | 2 Beaker‚ 50 mL Plastic(Dependent Variable) | 1 Test Tube(9)‚ 13 x 100 mm(Dependent Variable) | 1 Benedict’s Reagent - 15 mL in Dropper Bottle(Dependent Variable) | 1 Stove or Microwave(Independent Variable) | 1 Aluminum Foil 12 x 12 cm(Dependent Variable) | 1 Cylinder‚ 50 mL Plastic(Dependent Variable) | 1 Rod‚ Stirring rod – Glass(Dependent Variable) | 1 Sudan
Premium Starch Protein Glucose
Biuret Test Biuret Test • Biuret Test is a chemical test used to show/detect the presence of peptide bonds‚ which are the basis for the formation of proteins. Explanation In the presence of peptides‚ copper (II) ion forms a violet-colored coordination complexes in an alkaline solution. This test can be used to asses the concentration of protein because peptide bonds occur with the same frequency per amino acid in the peptide. According to Beer-Lambert Law‚ the intensity of the color and hence
Premium Amino acid Protein
Modbury High School SACE Stage 1 Chemistry Topic 5 Mole Concept and Stoichiometry Assignment 5: Volumetric analysis (titrations)‚ stoichiometry SOLUTIONS Note: Write answers neatly and legibly in your exercise book or on pad paper. ALWAYS include a title and name for your work and clearly indicate each answer. 1. a) 23.08 and 23.00 mL are concordant titre values. Average titre = (23.08 + 23.00) = 23.04 mL 2 b) Ca(OH)2
Premium Acetic acid Titration Laboratory glassware