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Amount of oxalic acid present in a solution can be determined by its titration with $\mathrm{KMnO}_4$ solution in the presence of $\mathrm{H}_2 \mathrm{SO}_4$. The titration gives unsatisfactory result when carried out in the presence of $\mathrm{HCl}$, because $\mathrm{HCl}$
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reduces permanganate to $\mathrm{Mn}^{2+}$
reduces permanganate to $\mathrm{Mn}^{2+}$
$\mathrm{HCl}$ being stronger reducing agent reduces $\mathrm{MnO}_4^{-}$to $\mathrm{Mn}^{2+}$ and result of the titration becomes unsatisfactory.
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