The dark purple colour of KMnO _ 4 disappears in the titration with...

The overall reaction takes place in the process is

$2{KMnO}_{4} + 3{H}_{2}{SO}_{4} + 5{\left(COOH\right)}_{2} \to {K}_{2}{SO}_{4} + 2{MnSO}_{4} + 8{H}_{2}O + 10{CO}_{2} ↑$

Potassium permanganate is a strong oxidising agent and in the presence of sulfuric acid it acts as a powerful oxidising agent. In acidic medium the oxidising ability of ${KMnO}_{4}$ is represented by the following equation.

${{MnO}_{4}}^{-} + 8{H}^{+} + 5{e}^{-} \to {Mn}^{2 +} + 4{H}_{2}O$