Question

A strip of impure copper metal is given to you. Describe briefly how you will purify it by using the chemical effect of electric current. Draw a labelled diagram of the experimental set up used for this purpose.

Answer 1

In the purification of copper by electrolytic refining, the strip of impure copper metal is made the anode and a strip of pure copper metal is the cathode. A solution of copper sulphate is used as the electrolyte. When current is passed through the electrolyte, pure copper from the anode dissolves in the electrolyte.

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Answer 2

Electrolytic refining

Explanation:

Impure copper can be purified by the process of electrolytic refining. The impure copper is made the anode an placed in an electrolyte bath of copper sulfate (CuSO4) and sulfuric acid (H2SO4). The cathode is a sheet of very pure copper. The impurities will fall to the bottom of the tank when electricity is passed. Pure copper will be deposited on the cathode.