Water primary, free energy change

The water of hydration irih and of solution are analogous and almost equal to the primary rrii and secondary moisture contents, respectively (Figure 30). Equations for the free energy changes associated with the water of hydration and of solution, in analogy with Equation 32 are given by... 

The equations for the heat of adsorption of water on a metal as a function of the separation distance and of the angular orientation of the water will be used in future work to find the optimum free energy of adsorption for anions on these metals. In one theory of ionic adsorption on mercury the separation distance for water was assumed to be equal to the radius of the molecule and the energy difference in primary, adsorbed waters reorienting in the field of the adsorbed ion would be one-half the experimental A77 . It is expected that this work will not only make it possible to extend this theory to other metals but it will improve the assumption of the theory by making more accurate predictions of the changes in number of molecules of water of hydration during adsorption. 

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