The amount of oxalic acid present in a solution can be determined by its titration with $KMnO_4$ solution in the presence of $H_2SO_4$. The titration gives an unsatisfactory result when carried out in the presence of $HCl$,because $HCl$:
- Agets oxidised by $KMnO_4$ to chlorine
- Bfurnishes $H^{+}$ ions in addition to those from oxalic acid
- Creduces permanganate to $Mn^{2+}$
- Doxidises oxalic acid to carbon dioxide and water
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