MHT CET 2024 Chemistry question

Calculate the pH of buffer solution containing 0.04 M NaF and 0.02 M HF

(A)4.5
(B)3.4Correct
(C)2.6
(D)5.1

Answer: (B)

Solution

The solution is an acidic buffer of HF (weak acid) and its salt NaF, so the Henderson-Hasselbalch equation applies: . Substituting, \log$ = 3.142 + 2 = 3.142 + 0.301 = 3.443

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Question ID VK-094899