The solvent structureless or not

Experiments and theoretical considerations, which will be described later, show that  

There can be situations where the energy of interaction between two ions of opposite charge becomes so high that the ions cease to be independent of each other, and move around as a single unit which survives throughout several collisions before being able to separate. Such a unit is called an ion pair. Ion pairs are found in aqueous solutions as well as in low polarity solvents. 

This is a very important topic in electrolyte studies and will be referred to often throughout this book. 

Ions can also be formed into clusters called micelles, and this can become very important in colloidal solutions. 

The solvent is the medium in which the solute exists. It is often called a dielectric. A dielectric can be thought of in terms of an insulator, which is a substance which stops or tends to stop the flow of charge, in other words to stop a current passing through it. 

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