APPARENT AND PARTIAL MOLAL VOLUMES OF CATION-SATURATED KAOLINS

Apparent and partial molal volumes of K-kaolin and K₂SO₄, Mg-kaolin and MgSO₄, and Ca-kaolin and CaCl₂ as a function of electrolyte and particle concentration were determined from density measurements at 30°C. The apparent (ø) and partial molal volumes (V) of the kaolin or the salts studied increase with concentration and are larger in salt-clay mixtures. Kaolin saturated with electro-strictive cations has lower volumes than that saturated with less strictive ones.