Lesson_25_-_Example_Solutions-2009

Lesson_25_-_Example_Solutions-2009 - Lesson 25 Example 25-1...

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Unformatted text preview: Lesson 25 Example 25-1 Is Cu + a stable ion in aqueous solution? To decide this, first determine the equilibrium constant for the reaction 2 Cu + = Cu 2+ + Cu Use two different pairs of half-reactions in your calculation. Note that they have different ∆ε o values but the same K value. ___________________________________________________________________________________________________________ _ Solution: (1) Cu + + e- → Cu ε o = 0.518 (2) Cu 2+ + 2 e- → Cu ε o = 0.339 (3) Cu 2+ + e- → Cu + ε o = 0.160 1 Lesson 25 1 st pair (1) Cu + + e- → Cu ε o = 0.518-(3) Cu + → Cu 2+ + e- ε o = - 0.160 2 Cu + → Cu 2+ + Cu ∆ ε o = 0.358 ( 29 ( 29 6 059 . 358 . 1 059 . o 10 x 17 . 1 10 10 K = = = ε ∆ n Since K is very large, Cu + is not stable in solution. Let’s check the calculations with another pair of half-reactions. 2 Lesson 25 2 nd pair (2) Cu 2+ + 2 e- → Cu ε o = 0.339-2x(3) 2 Cu + → 2 Cu 2+ + 2 e- ε o = -0.160 2 Cu + → Cu 2+ + Cu ∆ ε o = 0.179 ( 29 ( 29 6 059...
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This note was uploaded on 09/23/2010 for the course CHEM 103 taught by Professor Chem during the Fall '09 term at University of West Georgia.

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Lesson_25_-_Example_Solutions-2009 - Lesson 25 Example 25-1...

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