DETERMINATION OF EQUILIBRIUM CONSTANTS OF PHOSPHORIC ACID FROM EXPERIMENTAL pH VALUE USING THE LEAST SQUARES METHOD I. DETERMINATION OF THE FIRST DISSOCIATION CONSTANTS OF PHOSPHORIC ACID

Abstract

    The first acid dissociation constant of phosphoric acid was determined from pH values ofpotentiometric titration combined with an iterative approximation method using the leastsquares algorithm (with addition of ionic strength effect). The result shows a good correlationbetween experimentally determined pKai values and the values made publicly in referencematerial. The programme was written in Pascal language.