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SOLUBILITY, IONIC STRENGTH AND ACTIVITY COEFFICIENTS ...

Physical Chemistry Laboratory Experiment II-6b SOLUBILITY, IONIC STRENGTH AND ACTIVITY COEFFICIENTS . References: 1. See `References to Experiments' for text references. 2. W. C. Wise and C. W. Davies, J. Chem. Soc., 273 (1938), "The Conductivity of Calcium Iodate and its Solubility in Salt Solutions". Background: Study the references to the text and the section on "Theory and Discussion" carefully. Know the definitions of the following and their interrelations: ACTIVITY a, ion ACTIVITY , ai, mean IONIC ACTIVITY , a . ACTIVITY coefficient, , ion ACTIVITY coefficient, i, mean IONIC ACTIVITY coefficient, . Solubility, S in moles per liter Solubility product constant in terms of (a) molarity, K and (b) ACTIVITY , Ks. IONIC STRENGTH , I. Debye-Huckel Theory expressions, "Limiting Law" and "Detailed Law".

Physical Chemistry Laboratory Experiment II-6b [Ca+2]. The true thermodynamic equilibrium constant is K s. K s = a Ca2+ a IO 3 (!) 2 (3) The "thermodynamic solubility product constant," K s, at the given T and P is constant regardless of the concentrations of ions or of the presence of other ionic or molecular species in solution.

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