Abstract
Measurements have been made to determine the solubilities of oxygen, methane, ethane, and propane in aqueous solutions of sodium octanoate at 25°C and at pH values ranging from 7 to 13. The solubility of each gas obeys Henry's law at all surfactant concentrations and pH values. The solubilities measured for each gas are effectively independent of sodium octanoate concentration as well as pH at concentrations well below the CMC, and, within experimental error, are the same as the respective gas solubilities in pure water at 25°C. Above the CMC, the solubility of each gas increases with surfactant concentration indicating micellar solubilization. The degree of solubilization is greatest for propane and decreases in the order: propane > ethane > methane > oxygen. However, unlike the situation at low surfactant concentrations, the individual gas solubilities vary with pH at higher surfactant concentrations. The degree of solubilization is found to be quite constant for each gas at pH values greater than 9, and intramicellar solubilities derived from gas solubility data taken at pH 12 are identical to those determined for a similar surfactant having a seven carbon alkyl chain, sodium 1-heptane sulfonate. However, the extent of solubilization for each gas increases rapidly as the solution pH decreases from 9 to 7, suggesting that mixed micelles composed of octanoic acid and sodium octanoate are more effective solubilizing agents than those of the pure soap.
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