Write a balanced half-reaction for the reduction of bismuth oxide ion to bismuth ion in acidic aqueous solution. be sure to add physical state symbols where appropriate.

BiO₃⁻ → Bi³⁺

+5 + 3

Balance oxidation state:

BiO₃⁻ + 2 e⁻ → Bi³⁺

Balancing oxygen by adding water and balance H

BiO₃⁻ + 6 H⁺ + 2 e⁻ → Bi³⁺ + 3 H₂O

balance charge:

BiO₃⁻ + 6 H⁺ + 2 e⁻ → Bi³⁺ + 3 H₂O

+ 3 + 3

Final:

BiO₃⁻ + 6 H⁺ + 2 e⁻ → Bi³⁺ + 3 H₂O