Ultimate Redox Balancing Revision Paper + Final answer | High school Level | Oxidations Half reacti0n| Reduction Half reactions

REDOX BALANCING

Balance the following ionic equations:
1. Cl2+ IO3− + OH− → IO4− + Cl− + H2O
Oxidation half: IO3− + 2OH− → IO4− + H2O + 2e−
Reduction half: Cl2 + 2e- → 2Cl−
Overall reaction: Cl2 + IO3− + 2OH− → IO4− + 2Cl− + H2O


2. Cu2O + H+ + NO3− → Cu2+ + NO + H2O
Oxidation half: 3Cu2O + 6H+ → 6Cu2+ + 3H2O + 6e−
Reduction half: NO3− + 4H+ + 3e− → NO + 2H2O
Overall reaction: 3Cu2O + 14H+ + 2NO3− → 6Cu2+ + 2NO + 7H2O


3. MnO4− + C2O42− + H+ → CO2 + Mn2+ + H2O
Oxidation half: C2O42− → 2CO2 + 2e−
Reduction half: 2MnO4− + 16H+ + 10e− → 2Mn2+ + 8H2O
Overall reaction: 2MnO4− + 5C2O42− + 16H+ → 10CO2 + 2Mn2+ + 8H2O


4. Cr2O72− + SO2 + H+ → Cr3+ + HSO4− + H2O
Oxidation half: SO2 + 2H2O → HSO4− + 3H+ + 2e−
Reduction half: Cr2O72− + 14H+ + 6e− → 2Cr3+ + 7H2O
Overall reaction: Cr2O72− + 3SO2 + 5H+ → 2Cr3+ + 3HSO4− + H2O


5. Fe2+ + H+ + NO3− → Fe3+ + NO + H2O
Oxidation half: Fe2+ → Fe3+ + e−
Reduction half: NO3− + 4H+ + 3e− → NO + 2H2O
Overall reaction: 3Fe2+ + 4H+ + NO3− → 3Fe3+ + NO + 2H2O


6. MnO42− → MnO4− + Mn2+ (Basic medium)
Oxidation half: MnO42− → MnO4− + e−
Reduction half: MnO42− + 8H2O + 4e− → Mn2+ + 4H2O + 8OH−
Overall reaction: 5MnO42− + 4H2O → 4MnO4− + Mn2+ + 8OH−

7. I− + H+ + NO3− → I2 + NO + H2O
Oxidation half: 2I− → I2 + 2e−
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