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Q.

Few drops of HCl is added to acetic buffer. The pH is maintained constant by

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a

Cl-

b

CH3COO-

c

CH3COOH

d

Na+

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 CH3COO- 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) CH3COOH.

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Few drops of HCl is added to acetic buffer. The pH is maintained constant by