How can trace the impurities of magnesium, mercury and calcium be removed from a block of copper metal? No links please

Dear student, 

Copper metal can be purified by electrolysis. A thick block of impure copper can be used as anode. A thin block of pure copper is used as the cathode. Electrolyte used here is copper sulphate solution. When current passes through the electrolyte oxidation occurs at anode and Cu2+ is formed and is attracted towards the cathode. At the same time electolyte will dissolve the impurities present in the anode. Hence the anode will become thinner and thinner while the cathode will become thicker.

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