Abstract
Mean ionic activity coefficients at 25°C for HBr and SrBr2 in the system HBr + SrBr2 + H2O at constant total ionic strengths of 0.1–2 mol-kg−1 have been obtained by e.m.f. measurements. The results support previous findings1,2) that Pitzer's treatment of asymmetric mixtures of this type allowing for higher order electrostatic interactions between ions of the same charge sign is precise. For the HX+NX2+H2O systems the Pitzer interaction parameter ΨHNX can be conveniently set to zero without loss in accuracy in the description of the experimental results. With the exception of Mn2+, values of θHN (s), the Pitzer parameter governing short-range interactions between H+ and N2+ ions, vary only slightly with the Pauling ionic crystal radii of the different cations (N=Mg, Ca, Sr, Ba, Ni and Co).
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