How to balance redox reactions in basic solution

Balancing redox half-reactions in acidic solution
Fifteen Examples

Reminder: a redox half-reaction MUST be balanced both for atoms and charge in order to be correct.

Balancing redox reactions in acidic medium examples

It is VERY easy to balance for atoms only, forgetting to check the charge.

DON'T FORGET TO CHECK THE CHARGE.

Example #1: Here is the half-reaction to be considered:

MnO₄¯ ---> Mn²⁺

It is to be balanced in acidic solution.

Example #2: Here is a second half-reaction:

Cr₂O₇²¯ ---> Cr³⁺ [acidic soln]

As I go through the steps below using the first half-reaction, try and balance the second half-reaction as you go from step to step.

The answer will appear at the end of the file. Before looking at the balancing technique, the fact that it is in acid solution can be signaled to you in several different ways:

1) It is explicitly said in the problem.

10 examples of redox reaction equations

2) An acid (usually a strong acid) is included as one of the reactants.
3) An H⁺ is written just above the reaction arrow.
4) A term like "acid" or "acidic soln" is written after the half-reaction. Usually in parentheses or square bra

redox reaction in acidic solution practice

redox reaction in acidic medium