What is the half-equivalence point?

The half-equivalence point of an acid base titration is the point in which the concentration of an added base is equal to half of the original concentration of the acid. The half equivalence point is also known as the midpoint of a titration.

The half-equivalence point of an acid base titration is also the point in which the pH of the original aqueous acidic solution is equal to the pKa of the conjugate base of the acid. On a titration curve, the half-equivalence point occurs when exactly half of the total amount of base has been added to the reaction vessel.