C611ProblemSet12010_000

C611ProblemSet12010_000 - CHEMISTRY C611: ELECTROANALYTICAL...

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CHEMISTRY C611: ELECTROANALYTICAL CHEMISTRY Fall, 2010 Problem Set 1 1. Consider the galvanic (voltaic) cell Cu | CuCl 2 (0.15 M), Cl (0.77 M) || PuO 2 2+ (0.12 M), Pu 4+ (0.10 M), H + (2.63 M) | Pt and the following data: PuO 2 2+ + 4 H + + 2 e Pu 4+ + 2 H 2 O ; E ° = +1.067 V vs. SHE CuCl 2 + e Cu + 2 Cl ; E ° = +0.177 V vs. SHE (a) Write the two half-reactions and the overall (conventional) cell reaction. (b) Calculate E ° and K for the overall cell reaction. (c) Calculate E for the overall cell reaction. (d) If the cell is short-circuited, which electrode is the cathode? (e) What is the sign of the anode? 2. Consider the galvanic (voltaic) cell Ag | AgBr(s), HBr (0.30 M) || UO 2 2+ (0.0050 M), U 4+ (0.10 M), HClO 4 (0.20 M) | Pt and the following data: AgBr(s) + e Ag(s) + Br ; E ° = +0.073 V vs. SHE UO 2 2+ + 4 H + + 2 e U 4+ + 2 H 2 O ; E ° = +0.334 V vs. SHE (a) Write the half-reaction that occurs spontaneously at each electrode when the cell
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C611ProblemSet12010_000 - CHEMISTRY C611: ELECTROANALYTICAL...

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