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Question
What is the use of hydrogen peroxide in electrolysis?
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Solution
Hydrogen peroxide was produced by direct current electrolysis of aqueous solutions of sulfuric acid (or of potassium bisulfate or ammonium bisulfate):
H2SO4 <=> HSO4- + H+
On cathode:
2H+ + 2e' --> H2
On anode:
2HSO4- -2e' ----> H2S2O8
2H2SO4 --> H2S2O8 + 2H+ + 2e'
H2S2O8 + 2H2O --> 2H2SO4 + H2O2
H2SO4 <=> HSO4- + H+
On cathode:
2H+ + 2e' --> H2
On anode:
2HSO4- -2e' ----> H2S2O8
2H2SO4 --> H2S2O8 + 2H+ + 2e'
H2S2O8 + 2H2O --> 2H2SO4 + H2O2
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