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For the Henderson-Hasselbalch equation, under what conditions would you expect the pKa of the acid to equal the pH?

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Correct Answer: B. When the amount of conjugate base is the same as the acid
For the pH to equal the pKa, log(A-/HA) must be zero, which only occurs at log(1), meaning A-/HA = 1. Thus, the amounts of acid and conjugate base would be equal. This means that roughly half of the acid has dissociated.
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