High-concentration effects encounter theories

It can be seen from the table that the predictions of the Debye-Smoluchowski theory are as follows, (i) The formation and dissociation of an encounter-complex involving uncharged species is always a very rapid process, (ii) In solvents of high dielectric constant, such as water, charges have little effect on the rates, but in media of low dielectric constant both rate and equilibrium constants are drastically affected, (iii) In aprotic solvents of intermediate dielectric constant, the diffusion apart of ions is a slow process, and may be rate-limiting in an overall proton-transfer reaction, (iv) In media of low dielectric constant, free ions are not formed at the usual concentrations. In what follows, several of these predictions are used and tested in the interpretation of experimental data. 

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