Chemistry
During electrolysis of CuSO4 solution using platinum [cathode] and carbon [anode]:
(i) State what you observe at the cathode and anode.
(ii) State the change noticed in the electrolyte
(iii) Write the reactions at the cathode and anode.
Electrolysis
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Answer
(i) At cathode — Copper a brownish pink metal is deposited at the cathode.
At anode — Oxygen is liberated at the anode and water is formed.
(ii) The blue colour of CuSO4 solution fades since the blue Cu2+ ions which are discharged at the cathode are not replaced at the anode.
(iii) Cathode : Cu2+ + 2e- ⟶ Cu
Anode: OH1- - 1e- ⟶ OH x 2
[2OH ⟶ H2O + [O]]
4OH ⟶ 2H2O + O2
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