Balancing Redox Reactions Worksheet

Balancing Redox Reactions

Carefully balance each of the following redox reactions using the half-reaction method. Indicate whether the reaction takes place in an acidic or basic solution.

1. Balance the following redox reaction in an acidic solution: Cr₂O₇²⁻(aq) + Fe²⁺(aq) → Cr³⁺(aq) + Fe³⁺(aq)

2. Balance the following redox reaction in an acidic solution: MnO₄⁻(aq) + SO₂ (g) → Mn²⁺(aq) + SO₄²⁻(aq)

3. Balance the following redox reaction in a basic solution: Br⁻(aq) + MnO₄⁻(aq) → Br₂(l) + MnO₂(s)

4. Balance the following redox reaction in a basic solution: Al(s) + NO₃⁻(aq) → AlO₂⁻(aq) + NH₃(aq)

5. In the balanced half-reaction for the oxidation of Fe²⁺ to Fe³⁺ in acidic solution, how many electrons are lost?

6. In balancing redox reactions in basic solutions, after balancing oxygen with water and hydrogen with H⁺, you must add   to both sides to neutralize the H⁺ ions.

7. Oxidation involves the gain of electrons, while reduction involves the loss of electrons.