Preview

Nitration of Cobalt(Iii) Acetylacetonate

Powerful Essays
Open Document
Open Document
4164 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Nitration of Cobalt(Iii) Acetylacetonate
Rossi/Kuwata

Chemistry 222

Spring 2011

Experiment 2: Spectrophotometric Determination of Iron in Vitamin Tablets
(Adapted from Daniel C. Harris’ Quantitative Chemical Analysis and R. C. Atkins, Journal of Chemical Education 1975, 52, 550.)

Experimental work to be done on February 24 + one hour scheduled on your own Notebook due on March 4 (by 4:00 pm ⇒ 20% late penalty each 24 hour period thereafter)

INTRODUCTION
In this experiment, you will dissolve the iron in a vitamin supplement tablet, digesting the cellulosic matrix in the process, and then reduce the iron to Fe2+ with hydroquinone:

While freshly-dissolved aqueous Fe2+ is nearly colorless, we can impart an intense red color by a stoichiometric reaction of Fe2+ with three molecules of the ligand 1,10-phenanthroline (phen):

The absorption spectrum of the complex, often written as Fe(phen)32+, has a maximum at about 510 nm. This complex is stable indefinitely at pH values of 3 or higher. Measuring the analyte solution's absorbance at λmax is a sensitive method for determining iron concentrations. You will prepare a series of standard solutions containing known concentrations of Fe(phen)32+, as well as a solution with Fe from a vitamin tablet, and measure their absorbances on the Chemistry Department’s Beckman DU7400 spectrophotometer. Construction of a calibration curve using your standard solutions will allow you to determine both the molar absorptivity of the Fe(phen)32+ complex and, with a pair of measurements of the iron tablet solution's absorbance under the same conditions, the mass of iron that was present in your vitamin tablet.

WASTE DISPOSAL
All solutions from this experiment can go down the drain.

Page 1 of 8

Rossi/Kuwata

Chemistry 222

Spring 2011

SAFETY
• The hot HCl you are using in this experiment will release corrosive fumes, and will rapidly eat into any organic material with which it comes in contact. Wear gloves while working around the hot acid, and heat it only in a fume hood.

You May Also Find These Documents Helpful

  • Good Essays

    Chemistry

    • 390 Words
    • 2 Pages

    Place one scoop of magnesium turnings into the test tube. Add hydrochloric acid slowly and observe the reaction. Next, place a burning splint near the mouth of the test tube to test for the presence of hydrogen gas.…

    • 390 Words
    • 2 Pages
    Good Essays
  • Good Essays

    Prepare five solutions of FeSCN2+(aq) of known concentrations between 1x10-5M and 1x10-4M by diluting various volumes of 4.62x10-4 HSCN.…

    • 849 Words
    • 4 Pages
    Good Essays
  • Good Essays

    CHEM 2070 LAB

    • 604 Words
    • 3 Pages

    Purposes of Experiment: To synthesize a transition metal complex, potassium tris (oxalate)ferrate(III) trihydrate in a two step process, to learn new laboratory techniques such as decantation, recrystallization, gravity and suction filtration. Also the purpose of the experiment is to determine the actual, theoretical, and percent yields of product, and characterize the final compound by determining the number of waters of hydration by gravimetric analysis…

    • 604 Words
    • 3 Pages
    Good Essays
  • Good Essays

    Lab Report

    • 2156 Words
    • 9 Pages

    The objective of this lab was to consult for the FDA regarding a recently surfaced scandal involving false reporting of iron content in cereal as well as iron tablets. The makers of the cereal and the iron tablets, respectively, were allegedly reporting higher amounts of iron in their products than actually existed, as a way to save money but continue to provide products with “adequate” amounts of iron. The FDA needed consulting in order to analyze the products and use the data to determine the true amount of iron in each product, as well as confirm that the iron was usable by the human body. The methods used to analyze the products, data, and results will be provided in the sections below.…

    • 2156 Words
    • 9 Pages
    Good Essays
  • Good Essays

    Chem Lab 19A

    • 531 Words
    • 3 Pages

    2) When you add 6.0M NaOH into the iron (III) thiocyanate ion equilibrium system, the concentration of Fe3+ ion decreases. This causes the equilibrium system to shift to the left (reactant) side. This is why the solution becomes lighter yellow. Fe(OH)3 is also formed during the experiment.…

    • 531 Words
    • 3 Pages
    Good Essays
  • Good Essays

    Penny Lab Report

    • 674 Words
    • 3 Pages

    Note that HCl is an acid and must be cautious around this acid for it can burn your eyes so wear goggles, and wash hands after the lab.…

    • 674 Words
    • 3 Pages
    Good Essays
  • Good Essays

    Its a Gas Lab

    • 388 Words
    • 2 Pages

    Safety:The Hydrochloric acid used in this experiment could cause blindness upon contact with the eyes. Wear your goggles and handle it with care.…

    • 388 Words
    • 2 Pages
    Good Essays
  • Satisfactory Essays

    Iron (IIII) and copper (II) sulfate solution
Fill a small test tube halfway with copper (II) sulfate solution. Add a 2.0 gram iron rod to the solution and observe the reaction.…

    • 348 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Lab Report

    • 702 Words
    • 3 Pages

    Procedure: Safety goggles, gloves, and lab apron were put on. (Only the ones who were doing the experiment) 50mL of water was placed in the 100mL beaker and heated until boiled. And the boiled water will be used as the water bath. The lab marker was used to make 3 marks (1 cm apart). 1.0 M copper (II) nitrate was added to the first mark on the test tube. 1.0 M sodium hydroxide (NaOH) was added up to the second mark on the test tube. The solutions were mixed with the stirring rod. The test tube was put into the water bath. The burner was turned off and the test tube was cooled. 1.0 M hydrochloric acid (HCl) was added to the third mark on the test tube and was mixed. The 12 cm piece of aluminum was placed in the test tube. The wire was removed from the test tube. Lab station and equipment were cleaned.…

    • 702 Words
    • 3 Pages
    Good Essays
  • Good Essays

    When iron is mixed to Copper (Ⅱ) Chloride; the product will be copper and iron chloride. However, in this experiment, we do not have the information of the oxidation number for iron nails. There are 2 different oxidation numbers for iron; that are 2 or 3. We will need to check each of the equations to find out the moles of each element in the equation. Then we can compare the ratio between the mole and the mass of iron and copper; that will be measured during the experiment. Finally because of the balanced equation the ratio of the mass and the mole has to be the same; by this we can check the actual equation and the actual oxidation number of iron in this reaction. This process will finally end us up of finding out which oxidation number of iron is used in this experiment.…

    • 872 Words
    • 7 Pages
    Good Essays
  • Good Essays

    Hydrochloric acid is very corrosive, so care will be taken when handling it. Safety goggles will be worn throughout the investigation as the reaction could fizz violently and cause eye damage if it was to spit.…

    • 1754 Words
    • 8 Pages
    Good Essays
  • Satisfactory Essays

    Iron is a vital constituent of plant and animal life, and is the key component of haemoglobin.…

    • 279 Words
    • 2 Pages
    Satisfactory Essays
  • Powerful Essays

    1. Prepare three different solutions, each solution #1: 3mg Fe, 7mg SCN totaling 10 mL, using any amount of Fe3+ and SCN2+ #2: 4mg Fe, 6mg SCN and place each in separate cuvettes. #3: 5mg Fe, 5mg SCN…

    • 568 Words
    • 3 Pages
    Powerful Essays
  • Better Essays

    Case Study

    • 2180 Words
    • 7 Pages

    Approximately two-third of the iron in the body is stored in hemoglobin. The Surplus iron that is not available directly in the blood is stored in the iron-storing proteins known as ferritin. When dietary iron has been plentiful, ferritin is constantly and rapidly made and broken down, providing an ever-ready supply of iron. Ferritin is used as…

    • 2180 Words
    • 7 Pages
    Better Essays
  • Good Essays

    Butanol Lab

    • 466 Words
    • 2 Pages

    Safety: Concentrated hydrochloric acid is corrosive and the vapour is very irritating to the respiratory system. Avoid contact with skin, eyes, clothing, and the lab bench. Wear eye protection and a lab apron. All three alcohols are highly flammable. Do not use near an open flame.…

    • 466 Words
    • 2 Pages
    Good Essays