Abstract
The influence of sodium chloride addition upon the ability of aqueous sodium octanoate solutions to solubilize decan-1-ol has been studied. At low octanoate concentrations an addition of neutral salt increases the solubilizing capacity; this depends on the displacement of cmc toward lower concentrations, thereby causing an increase in the content of micellar matter. At high octanoate concentrations the neutral salt exerts the opposite effect; this is obviously a result of the increased number of counterions bound to the mixed micelles and the earlier formation of mesophases caused thereby. Between the limiting association concentration and the second critical concentration, within which region of the neutral salt-free system water-rich mesophases are formed (water-rich D, B, and C phase), the addition of sodium chloride causes a decrease in the water content of the mesophase. Above the second critical concentration where even in the absence of sodium chloride a water-poor mesophase (D phase) is formed, there will primarily be an increase in the octanoate content of the phase. The composition of the middle phase (E phase) seems to be rather unaffected by sodium chloride addition. At high neutral salt addition the formation of mesophases is replaced by the formation of crystalline sodium octanoate; simultaneously, the aqueous solubility of octanoate markedly decreases.
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