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In the electrolysis of CuSO4(aq) using copper electrodes, the reaction at the anode is

Chemistry
WAEC 2001

In the electrolysis of CuSO4(aq) using copper electrodes, the reaction at the anode is

  • A. discharge of SO4 2-
  • B. discharge of OH-
  • C. dissolution of copper electrode
  • D. evolution of oxygen
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Correct Answer: Option C
Explanation

When copper electrodes are used to electrolyze an aqueous copper sulfate solution, the following happens at the anode:

  • Copper loses electrons: Copper atoms at the anode lose electrons, forming copper ions that go into the solution. 
  • Anode dissolves: The anode slowly dissolves away as the electrolysis continues. 
  • Copper ions are generated: Copper ions are generated at the anode.  In summary, there is dissolution of copper electrode - Option C
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