1. Balancing Redox Reactions using the ½ Reaction Method

2. Half Reaction
_______________ – one of the two parts of a redox reaction
One half will be oxidation
One half will be reduction

3. Step to Balancing Half Reaction Method
Separate the reactions into 2 half reactions (one for oxidation & one for reduction)
Balance each ½ reaction un the following order:
Balance elements other than H & O
Balance O by adding H2O
Balance H by adding H+
Balance the charge to make each side equal

4. Step to Balancing Half Reaction Method
Multiply each ½ reaction by a number to make the number of electrons gained = the number of electrons lost
Add the ½ reactions
Simplify
Check your work

5. Example
Fe + CuSO4  Cu + Fe2(SO4)3

6. Another Example
AsO Zn  H3As + Zn +2

7. Try This one…
MnO C2O  Mn CO2

8. Last one…
KMnO4 + HCl  KCl + MnCl2 + H2O + Cl2