All GRE Subject Test: Chemistry Resources
Example Questions
Example Question #51 : Reactions Types
For which of the following acid-base reactions will the equilibrium lie on the left side?
Possible Answers:
Correct answer:
Explanation:
The pKa value indicates how strong an acid is, and acid strength increases as pKa decreases. The side of a reaction with a lower pKa is going to dissociate more, pushing the equilibrium over to the other side. The equilibrium will thus lie on the side with the HIGHER pKa.
Since the pKa of acetic acid (4.76) is higher than the pKa of trifluoroacetic acid (0), the reaction will shift to the left to reach equilibrium.
Gregory
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Pennsylvania State University-Main Campus, Bachelor of Science, Chemical Engineering. Carnegie Mellon University, Doctor of P...
Yongmao
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Nankai University, Bachelor of Science, Chemistry. Washington University in St Louis, Doctor of Philosophy, Organic Chemistry.
All GRE Subject Test: Chemistry Resources
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