Heats of Hydration
The solvation of ions by water is always exothermic.
DHhydr is related to the charge density of the ion, that is, both coulombic charge and ion size are important.
Lattice energy is the DH involved in the formation of an ionic solid from its gaseous ions.
Thus, DHsoln = -DHlattice + DHhydr
(for 1 mole of gaseous ions)
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