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Applications of Electrolysis and Electrolytic Cell

Cu+ is not st...

Question

$C u^{+}$ is not stable and undergoes disproportionation. $E^{0} for C u^{+}$ disproportionation is :

Given standard reduction potentials,
$E_{C u^{2 +} / C u^{+}}^{0} = + 0.15 V E_{C u^{+} / C u}^{0} = 0.53 V$

+ 0.68 V

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+ 0.19 V

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- 0.19 V

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+ 0.38 V

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Solution

The correct option is D $+ 0.38 V$
The disproportionation reaction of $C u^{+}$ is
$2 C u^{+} \to C u^{2 +} + C u (s)$
Here,
Oxidation reactions is
$C u^{+} \to C u^{2 +} + e^{-}$ (anode)

Reduction reaction is
$C u^{+} + e^{-} \to C u$ (Cathode)

Standard EMF of cell is,
$E_{c e l l}^{0} = E_{c a t h o d e}^{0} - E_{a n o d e}^{0}$
$E_{c e l l}^{0} = E_{C u^{+} / C u}^{0} - E_{C u^{2 +} / C u^{+}}^{0}$
$E_{c e l l}^{0} = 0.53 - 0.15$
$E_{c e l l}^{0} = 0.38 V$

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