Potassium permanganate is prepared from the minera lpyrolusite, MnO_(2). Its crystals have deep purple colour. It acts as an oxidizing agent in the neutral, alkaline as well as acidicmedium. In acidicmedium , it is used in volumetric analysis for estimationof ferrous salts, oxalates etc. The titrations are carried out in presence of H_(2)SO_(4). However ,before using itas a titrant, it is first standized with standard oxalic acid solution or Mohr salt solution. In one of the experiments on titration , 13.4 g of dry pure sodium oxalate ( molar mass =134 g mol^(-1) ) was dissolvedin 100mL of distilled waterand then 100 mL of 2MH_(2)SO_(4) were added. The solution, was cooled to 25.30^(@) C. Now to this solution , 0.1 M KMnO_(4) solution was added till a very faint pink colour persisted. If instead of H_(2)SO_(4), HCl or HNO_(3) of suitable concentration were used, the volume ofKMnO_(4) soltuionused would have been

Potassium permanganate is prepared from the minera lpyrolusite, MnO_(2

1.	Potassium permanganate is prepared from the minera lpyrolusite, MnO_(2). Its crystals have deep purple colour. It acts as an oxidizing agent in the neutral, alkaline as well as acidicmedium. In acidicmedium , it is used in volumetric analysis for estimationof ferrous salts, oxalates etc. The titrations are carried out in presence of H_(2)SO_(4). However ,before using itas a titrant, it is first standized with standard oxalic acid solution or Mohr salt solution. In one of the experiments on titration , 13.4 g of dry pure sodium oxalate ( molar mass =134 g mol^(-1) ) was dissolvedin 100mL of distilled waterand then 100 mL of 2MH_(2)SO_(4) were added. The solution, was cooled to 25.30^(@) C. Now to this solution , 0.1 M KMnO_(4) solution was added till a very faint pink colour persisted. If instead of H_(2)SO_(4), HCl or HNO_(3) of suitable concentration were used, the volume ofKMnO_(4) soltuionused would have been
Answer» less in case of HCL but more in case of `HNO_(3)` more in case of HCl but less in case `HNO_(3)` more in both cases less in both case Solution :IfHCl were used, the oxygen produced from `KMnO_(4)` will be partly used up for oxidation of HCl. HENCE, HCl required will be more. If `HNO_(3)` were used , it itself acts as oxidizingagent and willoxidize the reductant. Hence, `KMnO_(4)` SOLTUION used will be less.