(a) 50 mL of `0.2 N KMnO_(4)` is required for complete oxidation of 0.45 g of anhydrous oxalic acid. Calculate the normality of oxalic acid solution.
(b) In the titration of `Fe^(2+)` ions with `KMnO_(4)` in acid medium, why is dilute `H_(2)SO_(4)` used and not dilute HCl ?

Answer

(a) 0.2 N

Explanation

The reaction involved in the titration is :
`10FeSO_(4)+2KMnO_(4)+3H_(2)SO_(4) to 5Fe_(2)(SO_(4))_(3)+K_(2)SO_(4)+2MnSO_(4)+3H_(2)O`
If HCl is taken in place of `H_(2)SO_(4)`, then HCl will be oxidised to `Cl_(2)`