30ml of sample of hydrogen peroxide solution after acidification with dil. `H_2SO_4` required 30ml of 0.02M `KMnO_4` solution for complete oxidation. Calculate molarity and percentage strength of the solution.

Explanation

`2KMnO_4 to +5H_2O_2 + 3H_2SO_4 to K_2SO_4 + 2MnSO_4 + 8H_2O + 5O_2`
2moles of `KMnO_4 = `5moles `H_2O_2`
The equation for titration `(M_1V_1)/(n_1) = (M_2V_2)/(n_2)`
`(30 xx 0.02)/(2) =(M_(H_2O_2) xx 30)/(5)`
`M_(H_2O_2) = 5/2 xx 0.02 M`
Molarity of `H_2O_2` solution = 0.05M
(w/v)% of `H_2O_2` solution ` = M xx G.M.W// 10`
` = 0.05 xx 34//10 = 0.17%`