template_exp_4 - Name Lab Partner STOICHIOMETRY II PERCENT...

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Name: Lab Partner: Grading: 35 pts for this template DATA AND CALCULATIONS Unknown Number 1 Sample #1 Sample #2 Mass of Unknown 2.08 g 2.03 g Mass of filter paper 0.68 g 0.67 g Mass of filter paper and copper 1.12 g 1.1 g Mass of copper 0.44 g 0.43 g % mass of copper 21.03 % 21.16 % Formula weight of unknown 302.23 amu 300.27 amu 2 pts 2 pts Average formula weight 301.25 Unknowns Formula weights (amu) Copper(II) chloride dihydrate 170.45 1pt Copper(II) sulfate pentahydrate 249.55 1 pt Copper(II) acetate monohydrate 141.55 1 pt Identity of your copper salt CuSO4.5H2O 7 pt % Error 20.7 1 pt amu 1 pt STOICHIOMETRY II: PERCENT COPPER AND FORMULA OF A COPPER COMPOUND Purpose and Method ( 7pts ) The purpose of the experiment is to determine the percent copper and formula weight of a copper compound (in the original form of a salt). We will determine the percent copper in a copper-containing compound by first dissolving the copper salt in aqueous solution, then reducing the copper(II) ions to metallic copper with magnesium, a very reactive metal: [Cu]2+(aq) + Mg(s) -------> Cu(s) + [Mg]2+(aq) The metallic copper formed by the reaction will be collected by filtration, washed, fried and weighed. And then use:
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