Chem 142 - Lab 3 - Stoichiometry I

Chem 142 - Lab 3 - Stoichiometry I - NAME and ID Number:...

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Grading: 35 pts for this template DATA, CALCULATIONS AND GRAPHS Part I: Reaction of hydrogen peroxide and bleach Concentration of stock solutions Bleach, NaOCl(aq) 6 %m/m NaOCl 3.00 Mass of 0.500 mL Bleach, g Density of Bleach, g/ml 0.75 1.49 0.75 1.49 0.75 1.5 0.69 1.39 Average Density, g/mL 1.47 2 pts Run Number mL of Bleach Run 1 4.0 mL 1.02 22 Run 2 4.0 mL 1.69 36 Run 3 4.0 mL 2.05 44 Run 4 4.0 mL 2.53 56 1 pt Run 5 4.0 mL 3.18 65 Run 6 4.0 mL 3.62 65 Run 7 4.0 mL 4.03 65 Run 8 4.0 mL 4.53 68 Run 9 4.0 mL Run 10 4.0 mL Run 11 4.0 mL NAME and ID Number: Alice Hsieh 0734371 LAB PARTNER: Hieu Duong Quiz Section: AG Hydrogen Peroxide, H 2 O 2 (aq) % m/m H 2 O 2 Grams of Hydrogen Peroxide mL of Oxygen Generated EXPERIMENT 3: STOICHIOMETRY I. REACTION OF HYDROGEN PEROXIDE AND BLEACH II. REACTION OF IRON (II) WITH 1,10 PHENANTHROLINE Purpose and Method Things to think about: What is the goal of this experiment? Explain how it is accomplished. What is the general method (not step by step detailed procedure) that you will be using to achieve this goal? How will you process the data that you record in lab? (What calculations will you use and how do you obtain all of the values to plug into those equations?) Part I (3 pts) The goal of Part I of the experiment is to determine the stoichiometry of hydrgen peroxide and bleach of the chemical reaction by measuring the volume of oxygen gas produced when known amounts of hydrogen peroxide are mixed with known amounts of bleach. This requires multiple runs with different mass of hydrogen peroxide used. We can then plot a graph of volume of oxygen gas produced VS. the mass of hydrogen peroxide used. The intersection of the two lines is the equivalance point. From the equivalence point identified on the graph, we convert the mass of bleach and hydrogen peroxide into moles, and from these values the stoichiometry of the reaction can be calculated. Part II (3 pts) In Part II of the experiment, we are to find the equivalence point between iron (II) ion and 1,10 phenanthroline by monitoring the absorbance of phen solution with a colorimeter while slowly adding the iron (II) solution. Because we know the concentration of both phen solution and iron (II) solution, when we perform multiple trials of different volume of iron (II) solution added, we can plot the graph of absorbance VS. volume of iron (II) solution added and indicate the equivalence point. We can then calculate the number of moles of iron (II) and phen solution at teh equivalence point. The ratio n can be
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This note was uploaded on 10/27/2010 for the course CHEM 142 taught by Professor Zoller,williamh during the Winter '07 term at University of Washington.

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Chem 142 - Lab 3 - Stoichiometry I - NAME and ID Number:...

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