Well to find the pH at the equivalance point. According to mychemistry book( Chemistry: A Molecular Approach BY Nivaldo J. Tro,et. all.) . pH= pKa at the equivalnce point. Solution Well to find the pH at the equivalance point. According to mychemistry book( Chemistry: A Molecular Approach BY Nivaldo J. Tro,et. all.) . pH= pKa at the equivalnce point..