Question

Indicate the principle behind the method used for the refining of zinc.

Answer 1

Zinc is refined using electrolytic refining process. In this process, pure zinc is transported to cathode from the impure sample at anode. The more basic metal remains in the electrolytic solution and the less basic metals, present as impurities, precipitate as anode mud.

Electrode	Chemical Reaction
Anode	Zn → Zn2+ + 2e-             (From anode)
Cathode	Zn2+ + 2e- → Zn              (From electrolyte)