Excess thermodynamic properties nonelectrolyte solutions

Chapters 17 and 18 use thermodynamics to describe solutions, with nonelectrolyte solutions described in Chapter 17 and electrolyte solutions described in Chapter 18. Chapter 17 focuses on the excess thermodynamic properties, with the properties of the ideal and regular solution compared with the real solution. Deviations from ideal solution behavior are correlated with the type of interactions in the liquid mixture, and extensions are made to systems with (liquid + liquid) phase equilibrium, and (fluid -I- fluid) phase equilibrium when the mixture involves supercritical fluids. 

Chapter 2 (pVTx Properties of Hydrothermal Systems, H. R. Corti (Argentina) and I. M. Abdulagatov (Russia/ USA)) describes many theories and models developed to accurately reproduce the excess volmnetric properties and to assess the standard partial molar volmnes of the solute in aqueous electrolyte and nonelectrolyte solutions mider sub-and supercritical conditions. Most of these models and equations, particularly the equations of state, are used to compute both the thermodynamic properties of solutions and the phase equilibria. This chapter is concerned with theoretical approaches in modem chemical thermodynamics of hydrothermal systems. 

As in the nonelectrolyte case, the problem of representing the thermodynamic properties of electrolyte solutions is best regarded as that of finding a suitable expression for the non-ideal part of the chemical potential, or the excess Gibbs energy, as a function of composition, temperature, dielectric constant and any other relevant variables. 

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