Textbook Question
Complete and balance the following half-reactions in basic solution. In each case, indicate whether the half-reaction is an oxidation or a reduction. c. Cr(OH)3(𝑠)⟶CrO42−(𝑎𝑞)
6. Chemical Quantities & Aqueous Reactions
Balancing Redox Reactions: Basic Solutions
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Balance the following redox reaction in a basic solution. What is the coefficient in front of Br^- in the balanced reaction?MnO4^- (aq) + Br^- (aq) → BrO3^- (aq) + MnO2 (s)
A
4
B
1
C
2
D
3
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 oxygen and hydrogen first.
Balance the oxygen atoms by adding H2O molecules to the side that needs oxygen. Then balance the hydrogen atoms by adding OH^- ions to the side that needs hydrogen.
Write the reduction half-reaction: MnO4^- → MnO2. Balance the atoms other than oxygen and hydrogen first.
Balance the oxygen atoms by adding H2O molecules to the side that needs oxygen. Then balance the hydrogen atoms by adding OH^- ions to the side that needs hydrogen. Finally, balance the charges by adding electrons to one side of each half-reaction.
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