Answer to Question #305700 in General Chemistry for cornnnfrogeuu

Question

Balance the following redox equation by the ion-electron method: (in acidic solution)

H₂O₂ + Fe²⁺ --> Fe³⁺ + H₂O 

(electrochem)

Answer 1

The oxidation half reaction is Fe2+(aq)→Fe3+(aq)+e−
The reduction half reaction is H2​O2​(aq)+2H+(aq)+2e−→2H2​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.
2Fe2+(aq)→2Fe3+(aq)+2e−.
The oxidation half-reaction is then added to the reduction half-reaction to obtain a balanced chemical equation.
H2​O2​(aq)+2Fe2+(aq)+2H+→2Fe3+(aq)+2H2​O(l)