The correct order of enthalpy of hydration for the transition metal ions is
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Answer:
Cr2+ > Mn2+ > Co2+ > Ni. Ni2+ > Co2+ > Mn2+ > Cr.
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Cr2+ > Mn2+ > Co2+ > Ni.
The significance of ion hydration enthalpies in influencing salt solubilities was emphasized at the outset of this chapter. Using sodium chloride as an example, it was demonstrated that enthalpies of solution often indicate tiny discrepancies between large lattice enthalpies and large ion hydration enthalpies. The primary subjects of this part are the influence of ion hydration enthalpies on ion nature and the indications of the strength of ion-solvent interactions provided by ion solvation enthalpies (cf. spectroscopic indications of the strength of ion-solvent interactions covered in sections). However, a few phrases on the derivation of ion solvation enthalpies are necessary before discussing their values.