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The Effect of Water Activity on the Dissociation of Weak Ion Exchangers
Author(s) -
Michaeli I.,
Kinrot A.
Publication year - 1973
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.197300028
Subject(s) - chemistry , titration , dissociation (chemistry) , titration curve , ionization , self ionization of water , ion , weak base , molecule , salt (chemistry) , inorganic chemistry , organic chemistry
The effect of salt on the pH titration curves of weak acid or weak base ion exchangers is discussed, and conditions are formulated for the representation of such titration data by a single master curve. Inspection of experimental data both from the literature and from new measurements reported in this paper shows appreciable deviations from single master curves. These deviations are discussed in terms of the effect of salt on the activity of water. Thermodynamic considerations show that such deviations provide quantitative information on the number of water molecules taken up by the resin following the ionization of the weakly aeidic or basic groups involved. Relatively large changes in hydration are found in some systems; these are especially pronounced in systems undergoing conformational transitions.