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Balance the following redox reaction in acidic solution. Br? (aq) + MnO2 (s) ? Br2 (l)...

Balance the following redox reaction in acidic solution. Br? (aq) + MnO2 (s) ? Br2 (l) + Mn+2 (aq)

Solutions

Expert Solution

Unbalanced equation

Br- + MnO2 Br2 + Mn2+

Separate the redox reaction into half-reactions.

Oxidation

Br- Br2

Reduction

MnO2 Mn2+

Balance all other atoms except hydrogen and oxygen

Oxidation

2Br- Br2

Reduction

MnO2 Mn2+

Balance the oxygen atoms.

Oxidation

2Br- Br2

Reduction

MnO2 Mn2+ + 2H2O

Balance the hydrogen atoms.

Oxidation

2Br- Br2

Reduction

MnO2 + 4H+ Mn2+ + 2H2O

Balance the charge.

Oxidation

2Br- Br2 + 2e-

Reduction

MnO2 + 4H+ + 2e- Mn2+ + 2H2O

Make electron gain equivalent to electron lost.

Oxidation

2Br- Br2 + 2e-

Reduction

MnO2 + 4H+ + 2e- Mn2+ + 2H2O

Add the half-reactions together.

2Br- + MnO2 + 4H+ + 2e- Br2 + Mn2+ + 2e- + 2H2O
Simplify the equation.

2Br-(aq) + MnO2(s) + 4H+(aq) Br2(l) + Mn2+(aq) + 2H2O(l)

queen_honey_blossom answered 1 year ago
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