Q42 of 136 Page 38

When acidulated water (dil.H2SO4 solution) is electrolysed, will the pH of the solution be affected? Justify your answer.

The following reactions take place when acidulated water is electrolysed.

Anode: 2H2O(l)→ O2(g) + 4H+ (aq) + 4e–


Cathode: 4H+ + 4e-→ 2H2


Overall cell reaction: 2H2O(l) → O2(g) + 2H2(g)


pH remains the same because concentration of H+ ions remains constant.


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