Abstract
Aerosol OT distribution between water and carbon tetrachloride was investigated at 25° and analyzed on the basis of its thermodynamic parameters in both phases. The standard chemical potential difference, △μ° (ca. 0.54kcal/mole), on transfer of the solute from water to carbon tetrachloride phase was determined by direct measurement of the solute concentration in the dilute region, where the solute is monomeric in both phases. Activity coefficient vs. concentration relationships were obtained from vapor pressure depression data up to relatively high concentration regions in both phases over c.m.c., and concentration terms of chemical potential of Aerosol OT, 2RT ln γ'm' (in water) and RT ln γ″m″ (in carbon tetrachloride), were determined. For the sake of the unified description of solute chemical potential, the relative chemical potential diagram of Aerosol OT in water and carbon tetrachloride, based on the standard chemical potential in water, was drawn from △μ°, 2RT ln γ′m′, and RT ln γ″m″. From this diagram, the actual distribution can be estimated approximately, even in the high concentration region, where the direct measurement of solute concentration is difficult.
