ABSTRACT
When applying the laws of dilute solution physical chemistry, it is generally presumed that the solute is miscible with (soluble in) the solvent in the mixture of interest. If this is not true, then the mixture is heterogeneous (in a phase sense) and must be treated accordingly. In colloid science, solubility plays an important role in the collapse of the colloidal structure of emulsions and dispersions by ripening. It is apparent from these observations that solubility is a fundamental property of all surfactant systems, and because the practical utility of a consumer product is dictated by its physical chemistry and colloid science [1 ], solubility is therefore also relevant to utility and performance.
