Question

write the cathode reaction for the electrolytic refining of copper​

Answer 1

Answer:

Copper(II) sulphate solution is the electrolyte. Copper dissolves at the anode: Cu → Cu2++2e, and is deposited at the cathode. The net result is transfer of pure copper from anode to cathode. Gold and silver in the impure copper form a so-called anode sludge at the bottom of the cell, which is recovered.

Answer 2

Electrolytic Refining

Many metals like copper, zinc, tin lead are refined by this method.

Process Of electrolytic Refining :

➝ The apparatus consist of Electrolytic tank containing acidified copper sulphate solution as electrolyte.

➝ A thick block of impure copper metal is made anode .

➝ A thin strip of pure copper metal is made as cathode.

➝ On passing electricity, Impure copper from the anode dissolves and goes into CUSO₄ solution and pure copper from the copper sulphate solution deposits on the cathode.

Thus pure copper metal is produced at cathode . The soluble impurities goes into the solution whereas insoluble impurities settles down at anode as anode mud.