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  4. Amount of oxalic acid present in a solution can be determined by its titration with KMnO4 solution in the presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl

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Q. Amount of oxalic acid present in a solution can be determined by its titration with $KMnO_{4}$ solution in the presence of $H_{2}SO_{4}$. The titration gives unsatisfactory result when carried out in the presence of $HCl$, because $HCl$

Redox Reactions

Solution:

Oxalic acid present in a solution can be determined by its titration with $KMnO_{4}$ solution in the presence of $H_{2}SO_{4}$
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$K_{2}SO_{4}+2MnSO_{4}+10CO_{2}+5H_{2}O$
Titration cannot be done in the presence of $HCl$ because $KMnO_{4}$ being a strong oxidising agent oxidises $HCl$ to $Cl_{2}$ and gets itself reduced to $Mn^{2+}$ So actual amount of oxalic acid in solution cannot be determined