Chemistry
Write ionic reaction at the electrodes during the electrolysis of :
(i) copper II sulphate solution with copper electrodes,
(ii) acidulated water.
Electrolysis
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Answer
Dissociation of aq. copper sulphate
CuSO4 ⇌ Cu2+ + SO42- [ions present — Cu2+, H1+, SO42-, OH1-]
H2O ⇌ H1+ + OH1-
Reaction at cathode
Cu2+ + 2e- ⟶ Cu [product copper metal]
Reaction at anode
Cu - 2e- ⟶ Cu2+ [product nil - Cu2+ ions]
(ii) Dissociation of acidified water
H2SO4 ⇌ 2H1+ + SO42-
H2O ⇌ H1+ + OH1- [ions H1+, SO42-, OH1-]
Reaction at cathode
H1+ + 1e- ⟶ H x 4
2H + 2H ⟶ 2H2 [product Hydrogen gas]
Reaction at anode
OH1- - 1e- ⟶ OH x 4
4OH ⟶ 2H2O + O2 [product oxygen gas]
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