stoichiometry lab 3

# Stoichiometry lab 3 - NAME Quiz Section LAB PARTNER EXPERIMENT 3 STOICHIOMETRY I REACTION OF HYDROGEN PEROXIDE AND BLEACH II REACTION OF IRON(II

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NAME: LAB PARTNER: Quiz Section: Grading: 30 pts for this template, 5 pts for notebook pages Notebook pages: Purpose/Method section complete? Are they organized and legible? Have you plotted your data as instructed? DATA, CALCULATIONS AND GRAPHS Part I: Reaction of hydrogen peroxide and bleach Concentration of stock solutions Bleach, NaOCl(aq) 6 %m/m NaOCl 3 Mass of 0.500 mL Bleach, g Density of Bleach, g/ml 0.53 1.05 0.53 1.06 0.53 1.06 0.52 1.05 Avg. Density of Bleach g/mL 1.06 Run Number mL of Bleach Grams of Hydrogen Peroxide Run 1 4.0 mL 1.1 21 Run 2 4.0 mL 1.69 33 Run 3 4.0 mL 2.160 44 Run 4 4.0 mL 2.600 57 Run 5 4.0 mL 3.18 70 Run 6 4.0 mL 3.68 72 Run 7 4.0 mL 4.09 72 Run 8 4.0 mL 4.55 72 Hydrogen Peroxide, H 2 O 2 (aq) % m/m H 2 O 2 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) In Part I we will determine the stoichiometry of the equation involving hydrogen peroxide and bleach by observing the equivalence point of the reaction (reached when the mL of oxygen gas produced levels out, although hydrogen peroxide is still being added). We will combine hydrogen peroxide and bleach (the bleach amount remaining constant and using increasing amounts of hydrogen peroxide) and measure the amount of oxygen gas that is formed by connecting the reaction flask to a cylinder submerged in water with a tube, and measuring the amount of oxygen gas produced. Then by determining the densities of NaOCl and H2O2 we will be able to calculated the mole ratios Part II (3 pts) In Part II we will determine the equivalence point of iron(II) and 1,10-Phenanthroline solution (phen) by reacting increasing amounts of iron(II) and a constant amount of 1.0mL phen solution. We will use a colorimeter to measure the absorbency of the phen solution combined with the iron(II). Once the

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## This note was uploaded on 04/26/2010 for the course CHEM CHEM 142 taught by Professor Zoller during the Spring '10 term at University of Washington.

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Stoichiometry lab 3 - NAME Quiz Section LAB PARTNER EXPERIMENT 3 STOICHIOMETRY I REACTION OF HYDROGEN PEROXIDE AND BLEACH II REACTION OF IRON(II

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