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20 Electrochemistry Solutions to Exercises 20.23 Analyze/Plan. Follow the logic in Sample Exercises 20.2 and 20.3 to balance the given equations. Use the method in Sample Exercise 20.1 to identify oxidizing and reducing agents. Solve. (a) oxidizing agent, reducing agent, I⁻ (b) The half-reactions are: oxidizing agent, MnO₄⁻; reducing agent, (c) oxidizing agent, reducing agent, I₂ (d) oxidizing agent, NO₃⁻; reducing agent, (e) oxidizing agent, reducing agent, Br- (f) + oxidizing agent, ClO⁻; reducing agent, 20.24 (a) Net: oxidizing agent, reducing agent, (b) The oxidation half-reaction involves S, and is listed in Appendix E. The reduction half-reaction involves N, and must be written and balanced, according to the procedure in Section 20.2. 617