According to the Henderson-Hasselbalch equation, when the concentrations of proton acceptor and proton donor are the same, then A) the carboxylic acid is totally neutralized. B) only salt forms are present. C) pH = pK_a. D) pK_a= log[proton acceptor]/[proton donor].

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When the concentrations of the proton acceptor (base) and proton donor (acid) are equal, the pH equals the pKa according to the Henderson-Hasselbalch equation.

According to the Henderson-Hasselbalch Equation, When the Concentrations of Proton