Balancing Redox Reaction Video Lessons

Concept

# Problem: If you complete and balance the following equation in acidic solutionMn2+(aq) + NaBiO3(s)  →  Bi3+(aq) + MnO4-(aq) + Na+(aq)how many water molecules are there in the balanced equation (for the reaction balanced with the smallest whole-number coefficients)?

###### FREE Expert Solution

Mn2+(aq) + NaBiO3(s) → Bi3+(aq) + MnO4(aq) + Na+(aq)

Step 1. Separate the whole reaction into half-reactions

Mn2+(aq) → MnO4(aq)

NaBiO3(s) → Bi3+(aq) + Na+(aq)

Step 2. Balance the non-hydrogen and non-oxygen elements first

Mn2+(aq) → MnO4(aq)

NaBiO3(s) → Bi3+(aq) + Na+(aq)

Step 3. Balance oxygen by adding H2O to the side that needs oxygen (1 O: 1 H2O)

Mn2+(aq) + 4 H2O(l) → MnO4(aq)

NaBiO3(s) → Bi3+(aq) + Na+(aq) + 3 H2O(l)

Step 4. Balance hydrogen by adding H+ to the side that needs hydrogen (1 H: 1 H+)

Mn2+(aq) + 4 H2O(l) → MnO4(aq) + 8 H+(aq)

NaBiO3(s) + 6 H+(aq) → Bi3+(aq) + Na+(aq) + 3 H2O(l)

Step 5. Balance the charges: add electrons to the more positive side (or less negative side)

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###### Problem Details

If you complete and balance the following equation in acidic solution

Mn2+(aq) + NaBiO3(s)  →  Bi3+(aq) + MnO4-(aq) + Na+(aq)

how many water molecules are there in the balanced equation (for the reaction balanced with the smallest whole-number coefficients)?