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Addition of sodium acetate to a solution of acetic acid

Aincreases the degree of dissociation of acetic acid
Bincreases the value of $K_{a}$ of acetic acid
Cdecreases the degree of dissociation of acetic acid
Ddecreases the value of $K_{a}$ of acetic acid

Answer: C

Sodium acetate supplies

CH X_{3} COO X^{-}

, a common ion, so

CH X_{3} COOH CH X_{3} COO X^{-} + H X^{+}

shifts to the left. The degree of dissociation falls, while

K_{a}

depends only on temperature.

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