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How to Assign Oxidation Numbers. Balancing Redox: Half-Reaction Method. Balancing Redox: Half-Reaction Method. Balancing Redox: Half-Reaction Method. Balancing Redox: Half-Reaction Method. Balancing Redox: Half-Reaction Method. 2. 4.
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Balancing Redox: Half-Reaction Method 2 4 • 2MnO4- + 2H2O +5SO2 → 2Mn2++ 5SO42- + 4 H+
Balancing in basic conditions • Balance it as if it occurred in acid. • When done, add OH− to each side to “neutralize” the H+ in the equation and create water in its place. • If this produces water on both sides, you might have to subtract water from each side. 4OH- + 2MnO4- + 2H2O +5SO2 → 2Mn2++ 5SO42- + 4 H+ + 4OH- 2 • 4OH- + 2MnO4- + 2H2O +5SO2 → 2Mn2++ 5SO42- + 4 H2O