The methods for the determinations of dissociation or protonation constant and ion exchange equilibrium constant for weakly dissociating ion exchange resin and hydrous oxide by means of potentiometric titration are presented in this paper. The weakly acidic cation exchange resin and basic anion exchange resin, the chelating exchange resin in which the iminodiacetic acid groups are covalently bound to the matrix, and the chromatographic grade finely divided alumina are concerned.