Calculate the potential of the following cell at 298 K :
$Z n / Z n^{2 +} (a = 0.1) / / C u^{2 +} (a = 0.01) / C u$
$E_{Z n^{2 +}}^{o} / Z n = - 0.762 V$
$E_{C u^{2 +}}^{o} / C u = + 0.337 V$

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Solution

The standard reduction potential are 0.34V for $C u^{2 +} / C u$ and -0.76 V for $Z n^{2 +} / Z n$ . Calculate the emf of the cell and predict the cell feasibility.
emf of the cell $E_{c e l l}^{o} = E_{R}^{o} - E_{L}^{o}$
$= 0.35 - (- 0.76) V$
$= 1.10 V$

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