C611practiceEXAM12005_000

C611practiceEXAM12005_000 - CHEMISTRY C611:...

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CHEMISTRY C611: ELECTROANALYTICAL CHEMISTRY Examination 1 from Fall, 2005 1. (20 points) Consider the galvanic cell Au | AuCl 2 (0.12 M), AuCl 4 (0.050 M), Cl PuO (2.0 M) || 2 2+ (0.25 M), Pu 4+ (0.075 M), H + (1.5 M) | Pt and the following data: AuCl 4 + 2 e AuCl 2 + 2 Cl ; E º = +0.926 V vs. SHE PuO 2 2+ + 4 H + + 2 e Pu 4+ + 2 H 2 O ; E º = +1.067 V vs. SHE (a) Write the balanced half-reaction that occurs spontaneously at each electrode when the cell is short-circuited. (b) Write the balanced overall (conventional) cell reaction that occurs spontaneously when the cell is short-circuited. (c) Calculate the actual voltage of the cell. (d) Calculate the equilibrium constant for the balanced overall (conventional) cell reaction. (e) In order for the actual voltage of the cell to be zero, what would the concentration of PuO 2 2+ (f) If a saturated calomel electrode (SCE) is immersed into the solution contained in in the right-hand half-cell have to be? the right-hand half-cell, what would be the potential of the platinum (Pt) electrode
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C611practiceEXAM12005_000 - CHEMISTRY C611:...

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