Remember that when the pH is equal to the pKa value, the proportion of the conjugate base and conjugate acid are equal to each other. As the pH increases, the proportion of conjugate base increases and predominates.

How pH and pKa are related?

The lower the pH, the higher the concentration of hydrogen ions [H⁺]. The lower the pKa, the stronger the acid and the greater its ability to donate protons. pH depends on the concentration of the solution.

Does pKa equal pH at the end point?

The half equivalence point represents the point at which exactly half of the acid in the buffer solution has reacted with the titrant. The half equivalence point is relatively easy to determine because at the half equivalence point, the pKa of the acid is equal to the pH of the solution.