C611ProblemSet52010_000

C611ProblemSet52010_000 - CHEMISTRY C611: ELECTROANALYTICAL...

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CHEMISTRY C611: ELECTROANALYTICAL CHEMISTRY Fall, 2010 Problem Set 5 1. Calculate the faradaic current that should be flowing for a diffusion-controlled chronoamperometric experiment exactly 0.100 s after the imposition of a potential step which is sufficient to cause the concentration of electroactive species at the surface of a planar electrode to be zero, i . e ., C (0,t) = 0. Assume that n = 1, C * = 1.00 mM, A = 0.0100 cm 2 , and D = 1.00 × 10 –5 cm 2 s –1 . 2. During a chronoamperometric investigation of the reduction of 2.23 × 10 –3 tetroxide (OsO M osmium 4 0.0355 cm ) in 1 M hydrochloric acid at a planar mercury film electrode ( A = 2 ), the following data were collected: t , milliseconds i , milliamperes 1.07 2.443 2.63 1.460 5.10 0.987 7.63 0.807 11.98 0.644 17.22 0.537 24.31 0.452 37.15 0.366 (a) What is the evidence that the electron-transfer process is or is not diffusion- controlled? (b)
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C611ProblemSet52010_000 - CHEMISTRY C611: ELECTROANALYTICAL...

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