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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.

of interest and also on the diameters of ions of opposite sign that may be present in the solution. For aqueous solutions at 25oC, the value of A is 0.509; for Ca(IO 3) 2 with KCl ions, a value of B = 1.09 at 25oC seems to give the best value of the slope. Combining Eq. (8) for the (+) and (-) ions gives Eq. (10) for γ ±. Correspondingly Eq ...

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