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pH of a buffer made from 0.10 M CH₃COOH and 0.10 M CH₃COONa is closest to (pK_a = 4.74)
A3.74
B4.74
C5.74
D7.00
Answer & Solution
Correct answer: B. 4.74
1. Henderson-Hasselbalch: pH = pK_a + log([salt]/[acid]).
2. [salt] = [acid] = 0.10, so log(1) = 0.
3. pH = pK_a = 4.74.
_Source: Maharashtra Balbharati Std XII Chemistry, Ch 3 "Ionic Equilibria" §3.8_
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