The binary interactions (θH, K, SθH, Ni, SθH, Pr and SθH, Th) and the ternary interactions (ΨH, K, Cl) have been determined from published results, mostly from out laboratory. These results are compared with similar electrolyte mixtures containing bromide ion instead of chloride ion. It was found that Sθ values are in close agreements and Ψ values are different, as expected, from the Pitzer ion-interaction theory. For example θH, K (HCl + KCl) and θH, K (HBr and KBr) = 0.005 whereas ΨH, K, Cl = -0.006 and ΨH, K, Br = -0.014. These values will be interpreted in terms of the calculation of the mean molal activity coefficient γ±, of the component, (HCl) or KCl in mixtures of electrolyte solutions. The differences in γ± values from the simpler treatment (Harned empirical equations) and the comprehensive treatment of Pizter formalism will be discussed.

Application of the Pitzer Formalism for the aqueous solution of HCl + KCl, HCl + NiCl2, HCl + PrCl3, and HCl + ThCl4 at 25 °C

249th National Meeting (2015)

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