MHT CET 2024 Chemistry question

Which from following mixtures acts as a buffer?

(A)Acetic acid and sodium acetateCorrect
(B)Acetic acid and ammonium chloride
(C)Ammonium hydroxide and sodium chloride
(D)Formic acid and acetic acid

Answer: (A)

Solution

A buffer resists a change in pH on adding small amounts of acid or base; an acidic buffer is made from a weak acid and its salt with a strong base (common conjugate base), i.e. acetic acid and sodium acetate (CH_3COOH/CH_3COO^-). Hence option (A). (B)

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Question ID VK-099847