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Explain why the colour of KMnO4 disappears

Question:

Explain why the colour of KMnO4 disappears when oxalic acid is added to its solution in acidic medium.

Solution:

This is a redox titration. The deep purple colour of KMnO4 disappears due to the formation of MnSO4.

5H2C2O4 + 2KMnO4 +3H2SO4 ——>2MnSO4 + 8H2O + K2SO4 +10CO2

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