DOI: 10.1021/j150066a002. The calcium in gypsum attempts to keep earth soil particles flocculated or clustered together making soil more permeable. Given that the solubility product of gypsum is approximately 2.4 x 10-5, one can determine if a solution containing [Ca 2+] = 1 x 10-2 m and [SO 4 2] = 3 x 10 m is saturated with respect to the salt, if we know that the total ion activity coefficients for the two species of interest in this solution are, respectively, 0.225 m-1and 0.0843 m . The Journal of Physical Chemistry 1905, 9 (3) , 210-215. Solubility Measurements and Predictions of Gypsum, Anhydrite, and Calcite Over Wide Ranges of Temperature, Pressure, and Ionic Strength with Mixed Electrolytes. A least‐squares regression technique was developed to estimate eight temperature‐dependent Pitzer‐equation parameters that describe ion interactions among Ca, SO 4 , Na, and Cl. Frank K. Cameron, Atherton Seidell. Rock Mechanics and Rock Engineering 2017, 50 (2) , 327-339. The Solubility of Calcium Sulphate in Solutions of Other Salts. Gypsum Fact Sheet.docx Page 2 of 4 Most naturally occurring gypsums are coarse. A. L. Lebedev, V. L. Kosorukov. Solubility of Gypsum in Aqueous Solutions of Certain Electrolytes. Gypsum is likewise viable calcium manure. The solubility of gypsum is 0.26 kg/100L water at 20ºC. Coarse gypsum takes longer to dissolve, which may be either advantageous or disadvantageous. A fine particle size may be of importance where gypsum is dissolved in irrigation water, or a quick response is required. Gypsum solubility in water at 25°C. First, as a function of temperature at 1 atm, and second, as a function of temperature and pressure, while comparing the calculations with experimental solubility data. The gypsum solubility product was extrapolated to subzero temperatures by integrating the vant's Hoff equation using a published equation for the standard enthalpy of reaction for gypsum. DOI: 10.1007/s00603-016-1123-9. Example 2--Equilibration With Pure PhasesThis example shows how to calculate the solubility and relative thermodynamic stability of two minerals, gypsum and anhydrite. The solubility of the PG sample in distilled water (2.7 g/L) is nearly close to that of pure gypsum (2.25 g/L (Sfar Felfoul et al., 2002) and is higher in sodium chloride solution (10 g/L) than in sea water (3.9 g/L and 2.4 g/L respectively) (see Fig.

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