Final answer:
In balancing a redox reaction in an acidic aqueous solution, you may need to add H+, H2O, or OH- ions.
Step-by-step explanation:
In balancing a redox reaction that occurs in an acidic aqueous solution, you may need to add H+, H2O, or OH- ions to the equation.
If the reaction is occurring in an acidic solution, you may need to add H+ ions to balance the equation. On the other hand, if the reaction is occurring in a basic solution, you may add OH- ions to neutralize the H+ ions.
By addressing the contribution of the solvent in the redox reaction, you can ensure that the equation is properly balanced.