Question
Can you store copper sulphate solutions in a zinc pot?
✓
Answer
Zn being more reactive than Cu, displaces Cu from CuSO4 solution as follows: Zn (s) + CuSO4 (aq) → ZnSO4(ag) + Cu (s)
In terms of EMF, we have
Zn|Zn2+||Cu2+|Cu
$\text{E}^\circ_\text{cell}=\text{E}^\circ_{\text{Cu}^{2+}\text{Cu}}-\text{E}^\circ_{\text{Zn}^{2+}/\text{Zn}}$
= 0.34 V - (-0.76 V)
= 1.10 V
As $\text{E}^\circ_\text{cell}$ is positive, reaction takes place, i.e., Zn reacts with copper and hence, we cannot store CuSo4 solution in zinc pot.
In terms of EMF, we have
Zn|Zn2+||Cu2+|Cu
$\text{E}^\circ_\text{cell}=\text{E}^\circ_{\text{Cu}^{2+}\text{Cu}}-\text{E}^\circ_{\text{Zn}^{2+}/\text{Zn}}$
= 0.34 V - (-0.76 V)
= 1.10 V
As $\text{E}^\circ_\text{cell}$ is positive, reaction takes place, i.e., Zn reacts with copper and hence, we cannot store CuSo4 solution in zinc pot.
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