What is the pH at the first equivalence point? A)pH = pK_a1 B)pH = 14 - pK_a1 C)pH = (pK_a1 + pK_a2)/2 D)pH = pK_a1 + pK_a2

Question

Quizplus · Accepted Answer

At the first equivalence point of a diprotic acid titration, the pH is given by the average of the first and second acid dissociation constants (pKa values). This is because the species present at the first equivalence point is the first deprotonated form of the acid, which acts as an amphiprotic species, able to either donate or accept a proton.

What Is the PH at the First Equivalence Point