Homework 18 Key

Homework 18 Key - 3 O + ] in an acidic solution must...

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CHEM 1515 Homework 18 Key End-of-Chapter Problems
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Review and Discussion Questions 1. Percent ionization depends on concentration, whereas K a is independent of concentration. K a , because it is directly related to an equilibrium constant, is more directly useful in chemical calculations than percent ionization is. Very strong acids are easily ranked by different values of K a but have nearly identical percent ionizations in water. 3. An acidic solution is one in which [H 3 O + ] is greater than it is in a neutral solution. Since [H 3 O + ][OH - ] = K w , a constant, the greater [H
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Unformatted text preview: 3 O + ] in an acidic solution must correspond to a lower [OH-]. In terms of Le Chtliers principle, adding H 3 O + ( i.e. , making a solution more acidic) is a disturbance that drives the autoionization-of-water equilibrium in the direction of H 2 O production, thereby reducing the concentration of OH-. 8. HSO 4-is already negative, so the resulting conjugate base will have a charge of -2. This extra charge is less readily accommodated than the single charge on resulting from the first ionization step. Challenge Questions...
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This note was uploaded on 01/08/2012 for the course CHEM 1515 taught by Professor White during the Fall '11 term at Oklahoma State.

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Homework 18 Key - 3 O + ] in an acidic solution must...

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