AP Chemistry Exam Prep

Category - AP Chemistry

The common ion effect will occur with addition of which of the following substances to a solution of HF?
  1. NaH
  2. H2O
  3. KF
  4. CH3OH
  5. LiCl
Explanation
Answer: KF

The common ion effect occurs when the conjugate base of a weak acid (or vice versa) prevents ionization of the weak acid. The conjugate base of HF is F-. Therefore, the substance that will cause the common ion effect is KF.
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