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Why KMnO4 is a Self Indicator

Potassium Permanganate is a flexible and potent oxidant which can be used by overt or indirect titration to classify many compounds. A special value of Potassium Permanganate is that it acts as an indicator of its own. Permanganate titration must be carried out in a heavy acid solution.

It is reduced to brown coloured Mn2+ ion (in acidic media) at the end point when used in redox titration, and the colour transition at the end point can be quickly observed. Since the function of the indicator is to detect endpoints, a separate indicator for permanganate titration is not needed.

The Self Indication is essentially a chemical product that along with self-participation in the reaction, will mark the end point of a titration or some other reaction. But to suggest colour change, certain markers such as litmus do not modify its own chemical composition.

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