Abstract
The values of density and surface tension for aqueous solutions of [C4py][DCA] were determined from 0.01000 to 0.5000 mol kg−1 at T = (288.15–318.15) K. The values of the molar volume for aqueous solutions of [C4py][DCA], V, were calculated and increase with the increase in temperature and molarity. On the basis of a new thermodynamic function-molar surface Gibbs free energy, gs, a semi-empirical model for the IL solutions is proposed. It can be used to predict the surface tension, and the predicted values of the surface tension for aqueous [C4py][DCA] are in good agreement with the corresponding experimental ones. In terms of the concept of the molar surface Gibbs free energy, a new Eotvos equation is obtained. Each parameter of the new Eotvos equation has a clear physical meaning, energy dimension: the absolute value of slope is the mole surface entropy, s, and intercept is the molar surface enthalpy, h, which is temperature-independent.
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