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Equilibrium Constants between both Freshly Prepared and Aged H Montmorillonites and Chloride Salt Solutions¹

ABSTRACT

Freshly prepared and aged H montmorillonites were equilibrated with NaCl, KCl, MgCl₂, and CaCl₂ solutions of low concentrations. With freshly prepared H montmorillonites equilibrium constants were obtained. With aged H montmorillonites equilibrium constants were not obtained because the 1N KCl extracting technique did not yield the correct amount of adsorbed H⁺. To overcome this, a new method for determining adsorbed H⁺ was used. However, the measured equilibrium constants were either smaller or contradictory to those obtained with freshly prepared H montmorillonites because it was not possible to assess the exact amount of adsorbed H⁺ in the presence of hydroxyaluminum compounds. Thus, only equilibrium constants obtained with freshly prepared H montmorillonites were considered to be valid.

¹ This paper is based on part of a thesis accepted for the degree of Ph.D., University of California, Berkeley.

² Research Scientist and Senior Lecturer, respectively. The first-named author is at Canada Department of Energy Mines and Resources, Institute of Sedimentary and Petroleum Geology, Calgary, Alberta. The second-named author is at the Department of Soils and Plant Nutrition, University of California, Berkeley.

Received for publication July 17, 1968. Accepted for publication September 16, 1968.