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The equation ΔG = ΔG˚ + RT ln Q was derived for gaseous reactions where the quantities in Q were expressed in units of pressure. We also can use units of mol/L for the quantities in Q, specifically when considering aqueous reactions. With this in mind, consider the reaction HF(aq) --> H+(aq) + F- (aq) Ka = 7.2 x 10-4 at 25˚C Calculate ΔG for the reaction under the following conditions at 25˚C. Is the reaction at equilibrium? If not, which direction will the reaction shift to reach equilibrium for each of the five sets of conditions.

The equation ΔG = ΔG˚ + RT ln Q was derived for gaseous reactions where the quantities in Q were expressed in units of pressure. We also can use units of mol/L for the quantities in Q, specifically when considering aqueous reactions. With this in mind, consider the reaction HF(aq) --> H+(aq) + F- (aq) Ka = 7.2 x 10-4 at 25˚C Calculate ΔG for the reaction under the following conditions at 25˚C. Is the reaction at equilibrium? If not, which direction will the reaction shift to reach equilibrium for each of the five sets of conditions.

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter16: Thermodynamics: Directionality Of Chemical Reactions
Section: Chapter Questions
Problem 119QRT
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The equation ΔG = ΔG˚ + RT ln Q was derived for gaseous reactions where the quantities in Q were expressed in units of pressure. We also can use units of mol/L for the quantities in Q, specifically when considering aqueous reactions. With this in mind, consider the reaction

HF(aq) --> H+(aq) + F- (aq)

Ka = 7.2 x 10-4 at 25˚C

Calculate ΔG for the reaction under the following conditions at 25˚C. Is the reaction at equilibrium? If not, which direction will the reaction shift to reach equilibrium for each of the five sets of conditions.

a.[HF] = [H+] = [F- ] = 1.0 M

b. [HF] = 0.98M, [H+] = [F- ] = 2.7 x 10-2 M

c. [HF] = [H+] = [F- ] = 1.0 x 10-5 M

d. [HF] = [F- ] = 0.27 M, [H+] = 7.2 x 10-3 M

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