Abstract
Aqueous dispersions of calcium and barium soaps were prepared by direct mixing of metal nitrate solutions with solutions of potassium oleate. It was found that above a certain excess concentration of soap for a given concentration of metal nitrate, the turbidity decreases sharply, indicating stable dispersions of small particles. The larger the concentration of metal nitrate, the more potassium soap is required to produce stable sols of low turbidity. The transition between low and high turbidities in excess soap was labelled the critical transition concentration (c.t. c). The regions of low and high turbidity can only be compared at constant concentrations of potassium oleate or metal nitrate. A linear relationship was found for the c.t.c. when log [Me(NO3)2] was plotted against log [K-oleate].
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