Question

Explain why does colour of kmno4 disappear when oxalic acid is added to its solutions in acidic medium

Answer 1

Mn^2+ acts as auctocatalyst

Answer 2

Hey !!

KMnO₄ acts as oxidising agent. It oxidises oxalic acid to CO₂ and itself changes to Mn²⁺ ion which is colourless.

5C₂O₄²⁻ + 2MnO⁻₄+ 16H⁺ ----> 2Mn²⁺ + 8H₂O + 10CO₂

→ 2MnO²⁻₄ (Coloured)

→ 2Mn²⁺ (Colourless)

Good luck !!