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C611ProblemSet42010_000

C611ProblemSet42010_000 - If so how does the 2 In a study...

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CHEMISTRY C611: ELECTROANALYTICAL CHEMISTRY Fall, 2010 Problem Set 4 1. For the electrode reaction O + n e R consider the situation where C O * = C R * = 1.00 × 10 –3 M, k o = 1.00 × 10 –7 cm s -1 0.3, n = 1, and T = 298 K. , α = (a) Calculate the exchange-current density, j o , in µ A cm –2 , where j o = i o (b) Use an appropriate form of the Butler-Volmer equation to construct a plot of / A . current density, j (where j = i / A ), versus overpotential, η (where η = ( E E eq for the following values of η (in volts): 0.2, 0.1, 0, –0.1, –0.2, –0.3, –0.4, )), –0.5. (c) Using the results of part (b), construct a plot of log j versus η . Can you obtain a value for the exchange-current density ( j o result compare with that found in part (a)? ) from this plot?
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Unformatted text preview: If so, how does the 2. In a study of the reduction of aqueous zinc(II) at mercury to form an amalgam Zn 2+ + 2 e – + Hg Zn(Hg) the exchange-current density, j o , where j o = i o of solutions containing various concentrations of Zn / A , was determined for each of a series 2+ sodium perchlorate) in contact with a zinc amalgam of fixed composition: (in the presence of 0.9 M [Zn 2+ ], M j o , mA cm ____________________________________________________ –2 0.00142 7.09 0.00187 9.02 0.00234 10.4 0.00500 19.2 0.00705 24.3 0.0100 33.7 0.0160 47.5 (a) Evaluate α . (b) If the concentration of elemental zinc in the amalgam phase was 0.100 M, what is the value of k o ?...
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