Which of the following is a buffer solution?

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Question

(D) buffer solution is a mixture of a weak acid and its conjugate base (salt) or a weak base and its conjugate acid (salt).$PhCOOH$ (benzoic acid) is

Vedclass · Accepted Answer

$A$ solution of $PhCOOK$ and $PhCOOH$

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(D) buffer solution is a mixture of a weak acid and its conjugate base (salt) or a weak base and its conjugate acid (salt).$PhCOOH$ (benzoic acid) is a weak acid and $PhCOOK$ (potassium benzoate) is its salt with a strong base.Therefore,the mixture of $PhCOOH$ and $PhCOOK$ forms an acidic buffer solution.Other options do not represent a weak acid-conjugate base or weak base-conjugate acid pair.

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