Can you store copper sulphate solution in a ...

NCERT Class XII Chemistry
Chapter - Electrochemistry
Questions with Solutions

Question : 20 of 32

Marks: +1, -0

Can you store copper sulphate solution in a zinc pot ?

Solution:

E^\circ_{\mathrm{Zn}^{2+}/\mathrm{Zn}} = -0.76\ \mathrm{V}

E^\circ_{\mathrm{Cu}^{2+}/\mathrm{Cu}} = 0.34\ \mathrm{V}

We have to check whether the following reaction takes place or not.

\mathrm{Zn}_{(s)} + \mathrm{CuSO}_{4(\mathrm{aq})} \rightarrow \mathrm{ZnSO}_{4(\mathrm{aq})} + \mathrm{Cu}_{(s)}

E^\circ_{\text{cell}} = E^\circ_{\mathrm{Cu}^{2+}/\mathrm{Cu}} - E^\circ_{\mathrm{Zn}^{2+}/\mathrm{Zn}}

= 0.34\ \mathrm{V} - (-0.76\ \mathrm{V}) = 1.1\ \mathrm{V}

Since

E^\circ_{\text{cell}}

is positive, the reaction takes place and we cannot store

\mathrm{CuSO}_4

solution in a zinc pot.

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