MHT CET 2023 Chemistry question

What is pH of solution containing 50 mL each of 0.1 M sodium acetate and 0.01 M acetic acid (pK CHCOOH = 4.50)

(A)2.5
(B)3.5
(C)4.5
(D)5.5Correct

Answer: (D)

Solution

The mixture of a weak acid and its sodium salt is an acidic buffer, so the Henderson-Hasselbalch equation applies: . Equal volumes (50 mL each) are mixed, so both concentrations are diluted by the same factor

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Question ID VK-097413