Question

Explain the laboratory method for preparation of hydrogen peroxide.

Answer 1

Laboratory method of preparation of hydrogen peroxide.

(i)Acidifying $Ba{O}_2,8H_{2}O$(barium peroxide)and removing excess water by evaporation under reduced pressure gives $H_2{O}_2$

$Ba{O}_2.8H_{2}O\left(s\right)+H_{2}S{O}_4\left(aq\right)⟶BaS{O}_4\left(s\right)+H_2{O}_2\left(aq\right)+8H_{2}O\left(l\right)$

(ii)peroxy disulphate,obtained by electrolitic oxidation of acidfeed sulphate solutions at high current density on hydrogens yields $H_2{O}_2$.

$2HS{O}_4^{-}\left(aq\right)⟶H{O}_{3}SOOS{O}_{3}H\left(aq\right)⟶2HS{O}_4^{-}+2H^{+}\left(aq\right)+H_2{O}_2\left(aq\right)$

There are the $2$ methods used for laboratory preparation of $H_2{O}_2$.