Journal ArticleDOI
Polybasic Acid Character of Hydrogen Clay Minerals: Multiple Dissociation Constants and Free Energy Changes in Neutralisation Reaction
M. Adhikari,M. K. Majumdar +1 more
TLDR
In this paper, the titration behavior, the dissociation constants (pK values) of clay acidoids and the free energy changes in neutralisation reactions are dependent on the chemical composition and charge on unit structural layers.Abstract:
Potentiometric titration of clay poly acidoids prepared by the action of dilute acids on clay fractions isolated from kaolin, aquagel, sedimentary rock, soil, vermiculites and chlorite schist showed two inflections (except in acid montmorillonoid) due to reaction of H+ and Al3+ and polymeric hydroxy Al and Fe with bases. Attempt has been made to show how the titration behaviour, the dissociation constants (pK values) of clay acidoids and the free energy changes in neutralisation reactions are dependent on the chemical composition and charge on unit structural layers.read more
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Journal ArticleDOI
Buffer Curves of Acid Clays as Affected by the Presence of Ferric Iron and Aluminum1
N. T. Coleman,G. W. Thomas +1 more
TL;DR: In this paper, it is suggested that the apparent pH-dependent exchange capacity of some soils may be due to the presence of clay-sesquioxide complexes, through the interaction of positively charged metal ion-hydroxy complexes with exchange sites, with the progressive conversion of these to the corresponding hydroxides upon the addition of base.
Journal ArticleDOI
Some Properties of h- and Al-Clays and Exchange Resins
M. E. Harward,N. T. Coleman +1 more
Journal ArticleDOI
Hydrogen-Aluminum Clays: A Third Buffer Range Appearing in Potentiometric Titration.
U. Schwertmann,Marion L. Jackson +1 more
TL;DR: Wyoming montmorillonite treated with hydrogen-ionsaturated resin shows, on titration in 1N KNO3 with NaOH by a continuously recording instrument, a third buffer range between pH 5.5 and 7.6, comparable to "third range" buffering noted in aged, partially neutralized aluminum chloride solutions.