What is the Henderson-Hasselbalch equation used to calculate the pH of a buffer solution composed of weak acid HA and conjugate base A-?
Answer and explanation
Correct answer: D. pH = pKa + log([A-] / [HA])
The Henderson-Hasselbalch equation is pH = pKa + log([conjugate base] / [weak acid]). When [A-] = [HA], pH = pKa, which defines the center of optimal buffer capacity.
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