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The reaction is slower at first when only a few drops of Potassium permanganate are added. As soon as reaction proceeds more and more Mn2+ is formed in the solution. Mn2+ acts as an auto catalyst in this reaction. So, as the concentration of Mn2+ increases, rate of reaction becomes faster with time.
Explanation:
The redox reaction can be written as:
5H2C2O4 + 2MnO4- + 6H+ ------> 10CO2 + 2Mn2+ + 8H2O
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