Page 1 of 1

Balancing redox reactions in basic solutions

Posted: Sun Feb 24, 2019 5:15 pm
by Ashley Kenney 1E
Is there a way to tell which side of the reaction the OH- and the H2O should go on or is it just a matter of trying both until the equation is balanced?

Re: Balancing redox reactions in basic solutions

Posted: Sun Feb 24, 2019 5:26 pm
by Ashe Chen 2C
In acidic solution, balance O by using H2O and then balance H by using H+. In basic solution, balance O by using H2O; then balance H by adding H2O to the side of each half- reaction that needs H and adding OH- to the other side.

Re: Balancing redox reactions in basic solutions

Posted: Sun Feb 24, 2019 6:07 pm
by whitney_2C
Here some steps for balancing redox reactions that I found helpful

1. Divide the equation into oxidation and reduction half reactions.
2. Balance all elements besides hydrogen and oxygen.
3. Balance O by adding H2O to the appropriate side of each equation.
4. Balance H by adding H+.
5. Balance the charge by adding electrons.
6. Multiply the half reactions to make the number of moles of electrons equal for both half-reactions. Why? So we can cancel out all electron and balance the charge.
7. Cancel out any common terms and recombine the two half reactions.
8. Check to make sure you get the overall reaction.