Laboratory Report for Experiment 22

Laboratory Report for Experiment 22 - Laboratory Report for...

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Laboratory Report for Experiment 22: Voltaic Cells and Reduction Potentials Kevin Ho Chemistry 106, Section 10, T.A. Elsa I. Silva-Lopez Summary: The purpose of this lab was to measure the potential of several voltaic cells under certain conditions. Also, the relative reducing powers of metals were determined. Results: Half-Cell Reduction Potentials: Balanced Half-Reaction Experimentally Determined Half-Cell Potential Textbook value Mg 2+ (aq) + 2e - → Mg (s) 0.0V -2.37V Zn 2+ (aq) + 2e - →Zn (s) 1.607V 1.577V Pb 2+ (aq) + 2e - → Pb (s) 2.227V 2.244V Cu + (aq) +2e - →Cu (s) 2.707V 2.709V Ag + (aq) +e - →Ag (s) 3.155V 3.169V Cell Potentials: Balanced Cell Reaction Experimentally Determined Measured Literature Value Pb +Zn 2+ → Pb 2+ +Zn 0.620V 0.637V 0.630V Cu + Zn 2+ → Cu 2+ +Zn 1.100V 1.102V 1.100V 2Ag+ Zn 2+ →2Ag + +Zn 1.548V 1.562V 1.560V Cu +Pb 2+ →Cu 2+ + Pb 0.480V 1.594V 0.470V 2Ag + Pb 2+ →2Ag 2+ +Pb 0.928V 2.059V 0.930V 2Ag +Cu 2+ → 2Ag + +Cu 0.448V 0.465V 0.460V Discussion:
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I feel that the values measured in these experiments are not completely valid. I estimate the uncertainty to be less than 5%. I determined this by looking at the differences in the potential cell
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