Abstract
The stability constants of the ion pairs NaSO 4 −, KSO 4 −, MgSO 4 −, CaSO 4, MgCl + and CaCl + were determined at 25°C and 0.7 M formal ionic strength, by measuring the solubility of gypsum (CaSO 4 · 2H 2O) in different media. The media used contained one or two of the following electrolytes: NaCl, KCl, MgCl 2, NaClO 4, Mg(ClO 4) 2, Na 2SO 4. Values for the stability constants are 1.22, 1.84, 12.3, 30.6, 0.48 and 1.20 M −1, respectively, and the solubility product for gypsum is 2.87 · 10 −4 M 2. The distribution of the main constituents of seawater was calculated using these results and the values of the carbonate and bicarbonate constants given by Dyrssen and Hansson (1972–1973). The solubility of gypsum in seawater as calculated and determined experimentally was 21.43 m M and 21.10 m M, respectively.
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