Question

What happens when KMnO₄ is treated with an aqueous solution of MnSO₄?

Answer 1

When KMnO₄ is treated with an aqueous solution of MnSO₄ in an acidic medium, Mn²⁺ ions are oxidised and \[\ce{MnO^-_4}\] ions are reduced, both forming brown MnO₂ precipitate.

\[\ce{2MnO^-_4 + 3Mn^{2+} + 2H2O -> 5MnO2_{(s)} + 4H+}\]