alleryFor a buffer solution containing weak acid HA and its salt NaA, the pH is approximately:
ApKa
BpKa - log([salt]/[acid])
CpH = 7
DpKa + log([salt]/[acid])
Answer & Solution
Correct answer: D. pKa + log([salt]/[acid])
**Henderson-Hasselbalch equation:** pH = pKa + log([A-]/[HA]) = pKa + log([salt]/[acid]).
Buffer resists pH change on adding small amounts of acid or base.
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