Balance the following redox reaction by half reaction method :
H2O2 (aq) +Fe2+(aq) -> Fe3+ (aq) + H2 O(l) (acidic medium)
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Explanation:
The oxidation half reaction is Fe
2+
(aq)→Fe
3+
(aq)+e
−
.
The reduction half reaction is H
2
O
2
(aq)+2H
+
(aq)+2e
−
→2H
2
O(l).
In the above half-reactions, all the atoms are balanced.
The oxidation half-reaction is multiplied by 2 so as to balance the number of electrons in oxidation half-reaction with reduction half-reaction.
2Fe
2+
(aq)→2Fe
3+
(aq)+2e
−
.
The oxidation half-reaction is then added to the reduction half-reaction to obtain a balanced chemical equation.
H
2
O
2
(aq)+2Fe
2+
(aq)+2H
+
→2Fe
3+
(aq)+2H
2
O(l)
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