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Amount of oxalic acid present in a solution can be determined by its titration with KMnO4solution in the presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl i. reduces permanganate to Mn2+. ii. oxidises oxalic acid to carbon dioxide and water. iii. gets oxidised by oxalic acid to chlorine. iv. furnishes H+ ions in addition to those from oxalic acid.

Amount of oxalic acid present in a solution can be determined by its titration with KMnO4solution in the
presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl
i. reduces permanganate to Mn2+.
ii. oxidises oxalic acid to carbon dioxide and water.
iii. gets oxidised by oxalic acid to chlorine.
iv. furnishes H+ ions in addition to those from oxalic acid.

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2 Answers

Arun
25750 Points
3 years ago
Option (A) is correct. 
The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl reduces permanganate to Mn2+.
KMnO4​ can oxidise HCl  (along with H2​C2​O4​) into Cl2​ and itself gets reduced to Mn2+. 
Hence, the titration should be carried out in presence of sulphuric acid.
Vikas TU
14149 Points
3 years ago
The titration of oxalic acid with KMnO4 is presence of HCl gives unsatisfactory result because of the fact that KMnO4 can also oxidise HCl along with oxalic acid. HCl on oxidation gives Cl2 and HCl reduces KMnO4 to Mn2+ thus the correct answer is (c)

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