The cluster theory recently derived by Tani and Henderson has been extended to the unrestricted primitive model limiting the number of ions in the clusters to a pair. In this way it was possible to describe the osmotic coefficients of MSO4 aqueous solutions at 298 K up to 3 mol dm–3 employing a single freely adjustable parameter, the cation diameter σ+.This modified cluster theory is capable of accounting for the redissociation of associated electrolytes observed at higher concentrations and is consequently a very versatile tool to describe the behaviour of electrolytes over wide concentration and/or temperature ranges.
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Corti et al. (1986) studied this question.