Hydrophobic hydration for large charged ions

Again it is worthwhile to emphasise the crucial distinction between  

Ionic solutes are hydrated as a consequence of attractive electrostatic interactions between the charges on the ions and the dipoles of the water molecules. These interactions break down the tetrahedral arrangements of H-bonded water molecules near the ion to form a spherically symmetrical hydration shell which is not H-bonded in the pattern characteristic of the pure solvent. 

Non-polar and apolar solutes are hydrated not because of attractive interactions between the solute molecule and the dipoles of the water molecules, but because the presence of the solute molecule induces rearrangements of the H-bonds. Hydration of these solutes is possible because water can form another type of tetrahedral structure - cage arrays. But in these cages the solute molecule is surrounded by water molecules which are stiU H-bonded and tetra-hedraUy disposed. 

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