The amount of oxalic acid in a solution can be determined by titration with $KMnO_4$ in the presence of $H_2SO_4$. If the titration is performed in the presence of $HCl$,the results are unsatisfactory because $HCl$ ...
- Aoxidizes oxalic acid to carbon dioxide and water.
- Bis oxidized by $KMnO_4$ to chlorine.
- Cincreases the concentration of $H^+$ ions from oxalic acid.
- Dreduces $Mn^{2+}$ ions.
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