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NEET levelSingle correct optionDifficulty 1 of 3ie116

When a small amount of HCl is added to an acetic acid - sodium acetate buffer, the added $H X^{+}$ is mainly consumed by

A $CH X_{3} COO X^{-}$ ions
B $CH X_{3} COOH$ molecules
C $Na X^{+}$ ions
D $OH X^{-}$ ions of water in large quantity

Answer: A

The conjugate base reacts:

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

. The weak acid cannot remove

H X^{+}

, and

Na X^{+}

is a spectator.

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