Question
Fri December 28, 2012 By: Arun Mathew
 

PLEASE EXPLAIN PREPARATION OF HYDROGEN PEROXIDE BY ELECTROLYTIC METHOD

Expert Reply
Fri December 28, 2012

 H2O2 can be prepared by the electrolysis of 50% H2SO4solution. In a cell, peroxy disulphuric acid is formed at the anode.

2H2SO4 ——————? H2S2O8 (aq.) + H2(g)

Electrolysis Peroxy disulphuric acid

This is drawn off from the cell and hydrolysed with water to give H2O2.

H2S2O8 + 2H2O ——? 2H2SO4 + H2O2 The resulting solution is distilled under reduced pressure when H2O2 gets distilled while H2SO4 with high boiling point, remains undistilled.

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