Textbook Question
Balance each redox reaction occurring in basic aqueous solution. c. Cl2(g) → Cl–(aq) + ClO–(aq)
6. Chemical Quantities & Aqueous Reactions
Balancing Redox Reactions: Basic Solutions
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Balance the following redox reaction in basic solution: MnO4- (aq) + Br- (aq) → BrO3- (aq) + MnO2 (s). What is the coefficient in front of H2O in the balanced reaction?
A
5
B
4
C
3
D
2
Verified step by step guidance1
Identify the oxidation and reduction half-reactions. MnO4⁻ is reduced to MnO2, and Br⁻ is oxidized to BrO3⁻.
Write the oxidation half-reaction: Br⁻ → BrO3⁻. Balance the atoms other than O and H first, then balance O by adding H2O, and balance H by adding H⁺.
Write the reduction half-reaction: MnO4⁻ → MnO2. Balance the atoms other than O and H first, then balance O by adding H2O, and balance H by adding H⁺.
Since the reaction occurs in basic solution, add OH⁻ to both sides of each half-reaction to neutralize the H⁺ ions, forming water.
Combine the balanced half-reactions, ensuring that electrons are canceled out, and verify that the number of water molecules is balanced on both sides of the equation.
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