Abstract
The approach for description of structure of nonelectrolyte solutions and molten salt mixtures has been developed by such microstructure characteristic as a packing coefficient (y). It was shown the packing factor is one of the main parameters determining the interrelation between structure and volumetric-elastic properties. For nonideal solutions a new technique of computation of relative deviation of packing coefficient from the additive concentration rule (y E/y id) and the variation of y E/y id with temperature and pressure is offered. It gives a united scale for the comparison of structural variations in solutions with different types of interactions. The expresions obtained for y and y E give information on the important role of geometrical packing effect on volumetric-elastic properties. The values of y E/y id have been calculated for some solutions (32 systems). For solutions with different types of aqueous solutions are singled out. In particular, the absolute magnitudes of y E/y id for aqueous nonelectrolyte solutions were established to be about ten times higher compared with nonaqueous nonelectrolytes. Extra densification of structure related to ideal packing presented in aqueous solutions is explained on the structural basis. The pressure dependencies of y E/y id and for the substitution of H 2O by D 2O in nonelectrolyte solutions have been explained on the same structural basis.
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