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We present a systematic study of the effect of the ion pairing on thegas-liquid phase transition of hard-core 1:1 electrolyte models. We study aclass of dipolar dimer models that depend on a parameter R_c, the maximumseparation between the ions that compose the dimer. This parameter can varyfrom sigma_{+/-} that corresponds to the tightly tethered dipolar dimer model,to R_c --> infinity, that corresponds to the Stillinger-Lovett description ofthe free ion system. The coexistence curve and critical point parameters areobtained as a function of R_c by grand canonical Monte Carlo techniques. Ourresults show that this dependence is smooth but non-monotonic and convergesasymptotically towards the free ion case for relatively small values of R_c.This fact allows us to describe the gas-liquid transition in the free ion modelas a transition between two dimerized fluid phases. The role of the unpairedions can be considered as a perturbation of this picture.Comment: 16 pages, 13 figures, submitted to Physical Review

Dipolar origin of the gas-liquid coexistence of the hard-core 1:1 electrolyte model