Question

The standard reduction potentials of $C{u}^{2+}/Cu$ and $C{u}^{2+}/C{u}^{+}$ are $0.337V$and $0.153V$ respectively.

The standard electrode potential of $C{u}^{+}/Cu$ half cell is:

• A. $0.184V$
• B. $0.827V$
• C. $0.521V$
• D. $0.490V$

Answer 1

The correct option is C $0.521V$

$C{u}^{2+}+2e\to Cu;E^o=0.337V\therefore -\Delta G^o=-2\times 0.337\times F$

$Cu+\to C{u}^{2+}+e^{-};E^o=0.153V\therefore -\Delta G^o=0.153\times 1\times F$

$---$ (by substracting)
----------------------------------------------------------------------------------------------------
$C{u}^{+}+e\to Cu,-\Delta G^o=-0.521F$

$\because -\Delta G^o=-nFE$

$\therefore -0.521F=-F{E}^o$

$\therefore E^o=0.521V$

Hence,option C is correct.