Abstract
The strontium sulfate solubility has been studied in mixtures of isomolar MCl and HCl solutions (M = Li, Na, K, Cs) with ionic strengths of I = 0.5, 1.0, 2.0, 3.0, and 4.0 at 25°C. At I ≥ 2, the SrSO4 solubility as a function of hydrogen ion concentration passes through a maximum in all systems but (Li,H)Cl. The position of this maximum depends only slightly on the nature and ionic strength of the medium. The presence of the maximum is unambiguous evidence that there are secondary effects of the medium associated with the substitution of H+ for M+. These effects oppose the ordinary shift of the HSO4− formation equilibria. A method is suggested for separating these effects. The standard values of pSP0 and logβ0, determined by extrapolation to zero ionic strength, are in satisfactory agreement with the literature. The parameter α1, which characterizes the secondary effects of the medium on one of the basic equilibrium constants (log KS1O), increases in the order (Li,H)Cl < (Na,H)Cl < (K,H)Cl < (Cs,H)Cl.
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