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Question

Explain the laboratory method for preparation of hydrogen peroxide.

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Solution

Laboratory method of preparation of hydrogen peroxide.
(i)Acidifying BaO2,8H2O(barium peroxide)and removing excess water by evaporation under reduced pressure gives H2O2
BaO2.8H2O(s)+H2SO4(aq)BaSO4(s)+H2O2(aq)+8H2O(l)
(ii)peroxy disulphate,obtained by electrolitic oxidation of acidfeed sulphate solutions at high current density on hydrogens yields H2O2.
2HSO4(aq)HO3SOOSO3H(aq)2HSO4+2H+(aq)+H2O2(aq)
There are the 2 methods used for laboratory preparation of H2O2.

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