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Outline: 4/2/07

Outline: 4/2/07. Dr. Peaslee away today – back Wed. 5 CAPA sets remain! 4 weeks of classes remain! 3 chem seminars remain!. Today: Continue Chapter 19. Balancing redox reactions. Example.

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Outline: 4/2/07

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  1. Outline: 4/2/07 • Dr. Peaslee away today – back Wed. • 5 CAPA sets remain! • 4 weeks of classes remain! • 3 chem seminars remain! Today: Continue Chapter 19 • Balancing redox reactions

  2. Example Separate the following unbalanced redox processes into half-reactions. All occur in aqueous solution: • Cr2O72-(aq) + Fe2+(aq) Cr2+(aq) + Fe3+(aq) • H2O2(aq) + SO3-+(aq) SO42-(aq) • BrO2-(aq) BrO3-(aq) + Br-(aq)

  3. 0 Balancing REDOX Reactions • Example 1: Acidic conditions MnO4- + Br- Mn2+ + Br2 • Example 2: Basic conditions MnO4- + SO3- MnO42- + SO42-

  4.  2  5 5 e- +8 H+ + MnO4- Mn2++ 4 H2O MnO4- Mn2+ MnO4- Mn2+ + 4 H2O 8 H+ + • Example 1: Acidic conditions Br- Br2 2 Br- Br2 2 Br- Br2 + 2 e- Now, combine half-reactions 16 H+ + 2 MnO4- + 10 Br-  2 Mn2+ + 8 H2O + 5 Br2

  5. MnO4- MnO42- e- +  2 • Example 2: Basic conditions 2 OH- +H2O + SO32- SO42-+ 2 H2O 2 OH- +H2O + SO32- SO42-+ 2 H2O+2e- SO32- SO42- H2O + SO32- SO42- H2O + SO32- SO42-+ 2 H+ Now, combine half-reactions 2 OH- + 2 MnO4- + SO3- 2 MnO42- + SO42- + H2O

  6. Worksheet #11

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