12 .   Calculate   the   equilibrium   constant   for   the   redox   reaction   at   25 °   C . Fe 2 +   +   Ce 4 +     Fe 3 +   +   Ce 3 +   given   E ° Ce 4 + / Ce 3 + = 1 . 42   V   and   E ° Fe 3 + / Fe 2 + = 0 . 77 V .

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  • -3
cell = E°Ce4+/Ce3+ - E°Fe2+/Fe3+ = 1.42 - 0.77 = 0.65 V

At equilibrium, 
cell = RT/nF * lnKc = 0.65
0.059logKc = 0.65 (n = 1)
logKc = 11 (approx.)
Kc = 1011
  • -11
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