Ka vs Kb Weak Acids: Acetic Acid Low Ka, Lower Kb?

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SUMMARY

Acetic Acid is classified as a weak acid with a low acid dissociation constant (Ka), indicating that the forward dissociation reaction is not favored compared to the reverse reaction. The discussion reveals that the base dissociation constant (Kb) of its conjugate base, acetate, is even lower than the Ka of acetic acid. This phenomenon occurs because Kb is a property of the conjugate base rather than the acid itself, illustrating the relationship between an acid and its conjugate base in terms of their dissociation constants.

PREREQUISITES
  • Understanding of acid-base chemistry concepts
  • Familiarity with the definitions of Ka and Kb
  • Knowledge of weak acids and their dissociation behavior
  • Basic grasp of conjugate acid-base pairs
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UMath1
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Since Acetic Acid is a weak acid, it has a low Ka which means that the forward reaction is not favored as much as the reverse reaction. However, the Kb is even lower than the Ka...how is this possible? Shouldn't the Kb be higher to indicate that the reverse reaction is favored?
 
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Kb is not a property of the acid, but of the conjugate base.
 

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