Balancing Redox Equations Worksheet

Balancing Redox Equations

Balance the following redox equations using the specified method. Show all your work clearly.

1. Balance the following redox reaction in acidic solution using the oxidation number method:

Cr₂O₇²⁻(aq) + C₂H₅OH(l) → Cr³⁺(aq) + CO₂(g)

2. Balance the following redox reaction in basic solution using the half-reaction method:

MnO₄⁻(aq) + I⁻(aq) → MnO₂(s) + I₂(s)

3. In the reaction Fe²⁺ + MnO₄⁻ → Fe³⁺ + Mn²⁺ (acidic), what is the coefficient for H₂O when the equation is balanced?

4. In a redox reaction, the species that loses electrons is said to be  , and it acts as the   agent.

5. To balance oxygen atoms in acidic solution, you add  ; to balance hydrogen atoms, you add  .

6. In basic solutions, H⁺ ions are added to balance hydrogen atoms, and then OH⁻ ions are added to both sides to neutralize the H⁺ ions.