Question

Why titrated oxalic acid with potassium permanganate colour fade away after time?

Answer 1

Oxalic acid solution is heated before titration with KMnO4 solution because This reaction happens only in certain temperature. If not heated your Light pink titrated solution turns brown soon and reaction takes longer time.

The reaction between oxalic acid and potassium permanganate occurs in acidic medium, as permanganate ion is a powerful oxidizing agent in an acidic medium. ... KMnO4 acts as an indicator of where the permanganate ions are deep purple color.

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