Few drops of $H C l$ is added to acetic buffer. The pH is maintained constant by

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$C l^{-}$

$C H_{3} C O O^{-}$

$C H_{3} C O O H$

$N a^{+}$

answer is A.

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Detailed Solution

Upon reaction of HCl with acetic acid buffer, hydronium ions produce from HCl that reacts with $C H_{3} C O O^{-}$ and again produces acetic acid molecules. Thus, the concentration of the hydronium ions remains unchanged a pH is maintained constant.

Hence, the correct option is (1) $C H_{3} C O O H$ .

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