ElectrochemistryHard

Question

The standard potentials of MnO4−|Mn2+ and MnO2|Mn2+ electrodes in acid solution are 1.51 and 1.23 V, respectively. Standard electrode potential for the electrode, MnO4−|MnO2 in acid solution is

Options

A.+1.697 V
B.+5.09 V
C.+0.28 V
D.+1.37 V

Solution

$E_{MnO_{4}^{-}|MnO_{2}} = \frac{5 \times E_{MnO_{4}^{-}|Mn^{2 +}} - 2 \times E_{MnO_{2}|Mn^{2 +}}}{5 - 2}$

$= \frac{5 \times 1.51 - 2 \times 1.23}{3} = 1.697\text{ V}$

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