Chem 142 Lap Postlab Report #4

Chem 142 Lap Postlab Report #4 - Name: Lab Partner: Lab 4:...

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Name: Lab Partner: Grading: 35 pts for this template Data and Calculations Unknown Number 2 2 pts Sample #1 Sample #2 Mass of Unknown 2.01 g 2.01 g Mass of filter paper 0.67 g 0.67 g Mass of filter paper and coppe 1.250 g 1.26 g Mass of copper 0.582 g 0.59 g % mass of copper 29.03 % 29.26 % Formula weight of unknown 218.9 amu 217.17 amu Average formula weight 218.05 Unknowns Formula weights (amu) Copper(II) chloride dihydrate 170.48 1pt Copper(II) sulfate pentahydrate 249.69 1pt Copper(II) acetate monohydrate 199.65 1pt Identity of your copper salt Copper(II) sulfate pentahydrat 1pt % Error 12.67% amu 2pts CuCl 2 ·2H 2 O --> CuSO 4 ·5H 2 O--> Cu(CH 3 COO) 2 ·H 2 O--> Lab 4: Stoichiometry II Percent Copper and Formula of a Copper Compound Purpose and Method Things to think about: What is the goal of this experiment? What is the general method (not step by step detailed procedure) that you will be using to achieve this goal? (Include the chemical reaction to help explain.) 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?) (6 points) The goal of this experiment is to determine the percent copper in a compound by dissolving the copper salt in an aqueous solution and reducing the copper(II) ions to metallic copper with magnesium, a very reactive metal: Cu
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This note was uploaded on 04/06/2008 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 Lap Postlab Report #4 - Name: Lab Partner: Lab 4:...

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