Abstract
Multicomponent diffusion equations have been used to describe dissolution of a solid into a ternary liquid mixture. The example of dissolution of benzoic acid into aqueous sodium hydroxide solutions is treated in order to illustrate the importance of coupled diffusion. In this example, diffusion of dissolved acid from the solid/liquid interface into the bulk solution produces a large counterflow of sodium hydroxide. The resulting buildup of sodium hydroxide near the solid/liquid interface increases the steady-state solubility of benzoic acid in the interfacial solution by about 50% relative to its solubility in the bulk sodium hydroxide solution. Ternary diffusion coefficients for aqueous benzoic acid + sodium hydroxide mixtures at 25°C are reported.
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