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Very recently the effect of equisized charged hard sphere solutes in amixture with core-softened fluid model on the structural and thermodynamicanomalies of the system has been explored in detail by using Monte Carlosimulations and integral equations theory [J. Chem. Phys., 2012, 137, 244502].Our objective of the present short work is to complement this study byconsidering univalent ions of unequal diameters in a mixture with the samesoft-core fluid model. Specifically, we are interested in the analysis ofchanges of the temperature of maximum density (TMD) lines with ionconcentration for three model salt solutes, namely sodium chloride, potassiumchloride and rubidium chloride models. We resort to Monte Carlo simulations forthis purpose. Our discussion also involves the dependences of the paircontribution to excess entropy and of constant volume heat capacity on thetemperature of maximum density line. Some examples of the microscopic structureof mixtures in question in terms of pair distribution functions are given inaddition.

Density anomaly of charged hard spheres of different diameters in a mixture with core-softened model solvent. Monte Carlo simulation results