Solvation of non-polar and apolar molecules - hydrophobic effects

24 Solvation of non-polar and apolar molecules - hydrophobic effects 

The behaviour of noble gases and non-polar molecules has been used as a base-line for discussion of solvation of electrolytes. However, the molecular description of what happens 

When an apolar or non-polar solute is dissolved in water, intuitively it is not expected that there would be any interactions of the molecule with the dipoles of the water molecule. Yet, dissolution is accompanied by a large negative change in entropy which can only be explained by saying that the solute is doing something to the solvent stmcture which results in a large overall increase in order. 

This observation demands that the question should be asked  

Hydrophobic hydration involves relatively rigid cages around molecules of solute. In this way, a stmcture is formed which is more ordered than ordinary water. The observed large negative AS for hydration is thought to be a consequence of this. 

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