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Question
Illustrate oxidising, reducing and acidic properties of hydrogen peroxide with equations.
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Solution
Hydrogen peroxide can act oxidising agent and reducing agent in both acidic and basic medium.
(a) Oxidising action in acidid medium:
\[\ce{2Fe^{2+} + 2H^{+} + H2O2 -> 2Fe^{3+} + 2H2O}\]
(b) Reducing action in acidic medium:
\[\ce{2MnO^{-}4 + 6H^{+} + 5H2O2 -> 2Mn^{2+} + 8H2O + 5H2}\]
\[\ce{HOCl + H2O2 -> H3O^{-} + Cl- + O2}\]
(c) Oxidising action in basic medium:
\[\ce{2Fe^{2+} + H2O2 -> 2Fe^{3+} + 2OH-}\]
\[\ce{Mn^{2-} + H2O2 -> Mn^{4-} + 2OH-}\]
(d) Reduction action in basic medium:
\[\ce{I2 + H2O2 + 2OH- -> 2I- + 2H2O + O2}\]
\[\ce{2MnO^{-}4 + 3H2O2 -> 2MnO2 + 3O2 + 2H2O + 2OH-}\]
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