Lesson_24_-_Example_Solutions_-2009

Lesson_24_-_Example_Solutions_-2009 - Lesson 24 Example...

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Lesson 24 Example 24-1 Compare the ε o values for Fe 3+ to Fe 2+ and Fe(CN) 6 3- to Fe(CN) 6 4- . On this basis, which ion, Fe 3+ or Fe 2+ , forms a stronger complex with CN - ? ___________________________________________________________________________________________________________ _ Solution: Data : Fe 3+ + e - Fe 2+ ε o = 0.77 Fe(CN) 6 4- Fe(CN) 6 3- + e - ε o = -0.361 Combining the two half-cell reactions: Fe 3+ + Fe(CN) 6 4- Fe(CN) 6 3- + Fe 2+ ∆ ε o = 0.409 spontaneous direction 1
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Lesson 24 Therefore, Fe(CN) 6 3- is the more stable complex, and Fe 3+ forms a stronger complex with CN - . 2
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Lesson 24 Example 24-2 Bromine is sometimes used in place of chlorine as a disinfectant in swimming pools. If the effectiveness of a chemical as a disinfectant depends solely on its strength as an oxidizing agent, do you expect bromine to be better or worse than chlorine as a disinfectant, at a given concentration? ____________________________________________________________________________________________ Solution: The stronger an oxidizing agent, the higher its reduction potential. From Appendix E: Cl 2 ( g ) + 2 e - 2 Cl - ( aq ) ε o = 1.3583 V Br 2 ( g ) + 2 e - 2 Br - ( aq ) ε o = 1.065 V Therefore, Cl 2 is the stronger oxidizing agent and likely the better disinfectant.
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