chem lab exp. 7

chem lab exp. 7 - Laboratory 7 Decomposition of Compounds...

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Laboratory 7 Decomposition of Compounds and Determination of Percent by Mass Name: Norkhairin Yusuf Section Section 40, Monday 2 PM Performed: 20 October, 2008 Submitted 27 October, 2008 Laboratory Instructor: Hongmei Yuan Your Signature ___________________________________
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Useful equations Cu(s) + 4 H + (aq) + 2 NO 3 - (aq) a Cu 2+ (aq) + 2 NO 2 (g) + 2 H 2 O(l) Cu 2+ (aq) + 2 OH - (aq) a Cu(OH) 2 (s) Cu(OH) 2 (s) a CuO(s) + H 2 O(l) CuO(s) + 2 H + (aq) a Cu 2+ (aq) + H 2 O(l) Cu 2+ (aq) + Zn(s) a Cu(s) + Zn 2+ (aq) Purpose The purpose of this lab was to know what will be the amount of copper that can be recovered after going through series of reactions. Introduction Starting of with a sample of copper metal, then taking it through a series of reactions and at end of the process we measure the amount of original copper recovered. The practical application is that we could possibly follow this sequence to increase the purity of a metal by separating the impurities due to differences in physical and chemical properties. Experimental 1) About 0.35 grams of solid copper is weighed. a.
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chem lab exp. 7 - Laboratory 7 Decomposition of Compounds...

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