Most of the copper used to make wire has been electrically refined by depositing it from copper salt

Question

Most of the copper used to make wire has been electrically refined by depositing it from copper salts solution (divalent) on to a cathode. What is the cost of electrical energy required per kg of copper if the cost of electricity is Rs 4.00 per kWh and the cell operates at 0.33 V? The electrochemical equivalent of copper is 0.00033 g/coulomb.

Accepted Answer

Number of coulombs required = $\frac{1000}{0.00033}\text{ per Kg Cu}$

Energy required = $\frac{1000}{0.00033} \times 0.33 = 10^{6}\text{ J}$

∴ Cost of electricity = $\frac{4}{10^{3} \times 3600} \times 10^{6} = 1.11\text{ Rupee}$

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