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JAMB Chemistry 1988 Question 40

Question 40

Electrolysis

Crude copper can be purified by the electrolysis of CuSO4(aq) if

  1. A.platinum electrodes are used
  2. B.the crude copper is made the anode of the cell
  3. C.the crude copper is made the cathode of the cell
  4. D.crude copper electrodes are used.
Show the answer and explanation

Answer: B (the crude copper is made the anode of the cell)

Explanation

The impure copper anode dissolves as Cu2+ ions, and pure copper is deposited on a pure copper cathode. Impurities fall as anode sludge.