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ION–SOLVENT INTERACTIONS 119

When, as suggested by Bockris and Reddy, the number of water molecules that
stay with the ion (SN) is distinguished from the number that simply surround the first
shell (CN), will differ for molecules referred to as solvational coordinated
water and for those referred to as nonsolvational coordinated water (NSCW). Then
will be given by

Let’s now evaluate the different energy terms involved in calculating the heat of
hydration of the ions [Eqs. (2.61) and (2.62)] and compare the various models
described in Table 2.16.

2.15.11.1. Theenergy of an ion interacting with a water molecule
oriented along the ionic field is