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ION–SOLVENT INTERACTIONS 123

Fig. 2.39. The formation of an SB region of monomers can be treated
according to the cycle shown. (Reprinted from J. O’M. Bockris and P. P.
S. Saluja, J. Phys. Chem. 76: 2298, 1972.)

and

Here the terms refer to the vapor pressure of bulk water, while is that of
the structure-breaking region.
From Eqs. (2.77) and (2.78),

on the first-approximation assumption that the vapor pressures of the two forms of
water are not significantly different. Using a value of of 0.20 for
water in the SB region and 0.40 for

or