Hydrogen peroxide solution (20 mL) reacts quantitatively with a solution of KMnO_(4) (20 mL) acidfied with dilute H_(2)SO_(4).The same volue of theKMnO_(4) solution is just decoulurisedby 10 mL of MnSO_(4) in neutral medium forming a dark brown precipitate of hydrated MnO_(2) . the brownprecipitate isdissolved in 10 mL of 0.2M solution oxalate under boilingcondition in the presence of dilute H_(2)SO_(4).Writethe balancedequationsinvolved in teh reactions and calculate the molarity of H_(2)O_(2) .

Hydrogen peroxide solution (20 mL) reacts quantitatively with a soluti

1.	Hydrogen peroxide solution (20 mL) reacts quantitatively with a solution of KMnO_(4) (20 mL) acidfied with dilute H_(2)SO_(4).The same volue of theKMnO_(4) solution is just decoulurisedby 10 mL of MnSO_(4) in neutral medium forming a dark brown precipitate of hydrated MnO_(2) . the brownprecipitate isdissolved in 10 mL of 0.2M solution oxalate under boilingcondition in the presence of dilute H_(2)SO_(4).Writethe balancedequationsinvolved in teh reactions and calculate the molarity of H_(2)O_(2) .
Answer» Solution :m.e of `H_(2)O_(2)` in 20 mL solution = m.e of 20 mL of `KMnO_(4)` = m.e of 20 mL of `MnsO_(4)` = m.e of `MnO_(2)` = m.e of `Na_(2)C_(2)O_(4)` ` = 0.4 xx 10 ` (NORMALITY = MOLARITY `xx` change in ON) = 4 EQ. of `H_(2)O_(2)` in 20 mL solution ` = 4/1000` Moleof `H_(2)O_(2)//20 mL = 4/1000 xx1/2 ` Molarity (mole.L) = `4/2000 xx 1000/20` `0.1 M ` The reactions involved are , `5H_(2)O_(2)+2KMnO_(4)+3H_(2)SO_(4)=2MnSO_(4)+K_(2)SO_(4)+8H_(2)O+5O_(2)` `2KMnO_(4) +3MnSO_(4) +2H_(2)O = 5MNO_(2) +2H_(2)O ` `MnO_(2) +Na_(2)C_(2)O_(4) +2H_(2)SO_(4) = MnSO_(4) +Na_(2)SO_(4) +CO_(2)+2H_(2)O `