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A piece of zi...

Question

A piece of zinc metal is dipped in a $0.1 M$ solution of zinc salt. The salt is dissociated to the extent of $20$ %. Calculate the electrode potential of $Z n^{2 +} / Z n$ .
(Given: $E_{Z n^{2 +} / Z n}^{\circ} = - 0.76 v o l t$ ).

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Solution

$[Z n^{2 +}] = 0.1 \times 0.2 = 0.02 M$
$Z n^{2 +} + 2 e^{-} \to Z n$ (Reduction)
$E_{Z n^{2 +} / Z n} = E_{Z n^{2 +} / Z n}^{\circ} + \frac{0.0591}{2} {log}_{10} [Z n^{2 +}]$ .
$- 0.8102 v o l t e$ .

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