Ncert Exercises & Solutions

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

Since pH of solution depends upon concentration of H⁺ presence in solutions. pH of the solution will not be affected as [H⁺] remains constant.

At Anode

2 H_{2} O ⟶ O_{2} + 4 H^{+} + 4 e^{-}

At cathode

4 H^{+} + 4 e^{-} ⟶ 2 H_{2}