Halfway to the equivalence point in a titration curve of a weak acid with a strong base,__________

Question

Quizplus · Accepted Answer

At halfway to the equivalence point, the moles of the strong base added are equal to half of the moles needed to reach the equivalence point. At this point, the weak acid has been partially neutralized, but there is still a significant amount of the weak acid present. Therefore, the pH of the solution is determined by the dissociation constant (pKa) of the weak acid and the concentration of the remaining weak acid. The Henderson-Hasselbalch equation can be used to determine the pH at this point, which is pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the conjugate base and [HA] is the concentration of the weak acid. At halfway to the equivalence point, [A-] = [HA], so the pH is equal to the pKa of the weak acid.

Halfway to the Equivalence Point in a Titration Curve of a Weak