Why is oxalic acid heated before titrating against KMnO₄ ?

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Solution

The reaction between oxalic acid and permanganate is a complex reaction and the rate of the reaction is very slow at room temperature. The formation of
Mn²⁺which acts as a catalyst to speed up the reaction is necessary which is achieved by the decompostion of KMnO₄. For this hot oxalic acid is needed.

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Why in the redox titration of $K M n O_{4}$ vs oxalic acid, we heat oxalic acid solution before starting the titration ?

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