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Solubility of Calcium Carbonate Precipitated in Montmorillonite Suspensions¹

ABSTRACT

Calcium carbonate precipitated in Ca- and Mg-saturated montmorillonite suspensions was more soluble than calcite added to these suspensions. The CaCO₃ precipitated from a clay suspended in Ca(OH)₂ had a greater solubility than when the CaCO₃ was precipitated by the addition of CaCl₂ and NaHCO₃. The difference in solubility between the two directions of approach to equilibrium was related to the amount of soluble Mg in the system. When CaCO₃ was precipitated from CaCl₂ and NaHCO₃ in clay suspensions with Mg-saturation as a variable, its solubility was related to the amount of Mg in solution with apparently no effect of the clay per se.

¹ Contribution from the Department of Soils and Plant Nutrition, University of California, Riverside.

² Former Graduate Research Assistant and Professor of Soil Science, respectively.

Received for publication March 7, 1968. Accepted for publication June 25, 1968.