Chemistry
Explain the electrolysis of copper sulphate solution using copper electrodes with
(i) a labelled diagram
(ii) equations
(iii) observation
Electrolysis
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Answer
(i) Below labelled diagram shows the electrolysis of copper sulphate solution using copper electrodes:
(ii) Dissociation of aq. CuSO4 :
CuSO4 ⇌ Cu2+ + SO42-
H2O ⇌ H1+ + OH1-
Reaction at cathode [pure thin sheet of Cu]:
Cu2+ + 2e- ⟶ Cu [Cu deposited on thin sheet]
Reaction at anode [impure block of active Cu]:
Cu - 2e- ⟶ Cu2+ [product nil - Cu2+ ions]
(iii) The observations at the anode & at the cathode are:
At cathode — Brownish pink copper metal is deposited at cathode during electrolysis of copper sulphate.
At anode — Copper ions are formed. Copper anode diminishes in mass.
Blue colour of CuSO4 remains unchanged.
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