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How to Assign Oxidation Numbers

Learn how to assign oxidation numbers and balance redox reactions using the half-reaction method. This tutorial focuses on balancing complex reactions, specifically under basic conditions. We will demonstrate how to balance the reaction: 2MnO4^- + 2H2O + 5SO2 → 2Mn^2+ + 5SO4^2- + 4H^+. After balancing in acidic conditions, we will add OH⁻ to neutralize H⁺ ions, balancing the overall equation accurately and ensuring correct stoichiometry. Perfect for chemistry students or anyone interested in mastering redox processes!

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How to Assign Oxidation Numbers

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  1. How to Assign Oxidation Numbers

  2. Balancing Redox: Half-Reaction Method

  3. Balancing Redox: Half-Reaction Method

  4. Balancing Redox: Half-Reaction Method

  5. Balancing Redox: Half-Reaction Method

  6. Balancing Redox: Half-Reaction Method 2 4 • 2MnO4- + 2H2O +5SO2 → 2Mn2++ 5SO42- + 4 H+

  7. 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

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