Redox reactions commonly take place in acidic solutions. The could just as easily take place in basic solutions. This example problem shows how to balance a redox reaction in a basic solution.

Redox reactions are balanced in basic solutions using the same half-reaction method demonstrated in the example problem "Balance Redox Reaction Example". In summary:

1. Identify the oxidation and reduction components of the reaction.
2. Separate the reaction into the oxidation half-reaction and reduction half-reaction.
3. Balance each half-reaction both atomically and electronically.
4. Equalize the electron transfer between oxidation and reduction half-equations.
5. Recombine the half-reactions to form the complete redox reaction.

This will balance the reaction in an acidic solution, where there is an excess of H⁺ ions. In basic solutions, there is an excess of OH^- ions. The balanced reaction needs to be modified to remove the H⁺ ions and include OH^-ions.

Problem:

Balance the following reaction in a basic solution:

Cu(s) + HNO₃(aq) → Cu²⁺(aq) + NO(g)