Acid-Base Equilibria in Solutions of Polyacid Bases(Model and Experiment):II.Thermodynamic Dissociation Constants of Tribasic Acids

摘要

A model is developed for estimating thermodynamic dissociation constants of tribasic acids in organic solvents,with an example of ethanol solution of citric acid in which the functional groups are neutralized jointly.The known methods for calculating and determining dissociation constants of dibasic acids at joint neutralization of functional groups,suggested by Speakman[2,3]and later by Bates[4],are applicable only to aqueous solutions in which the activities of hydrogen ions can be determined directly.