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SAT Chemistry

Category - Multiple Choice

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The common ion effect will occur with addition of which of the following substances to a solution of HF?

NaH
H₂O
KF
CH₃OH
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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