Mutual diffusion coefficients of aqueous MnCl2 and CdCl2, and osmotic coefficients of aqueous CdCl2 at 25°C |
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Authors: | Joseph A Rard Donald G Miller |
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Institution: | (1) Lawrence Livermore National Laboratory, University of California, 94550 Livermore, CA |
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Abstract: | Volume-fixed mutual diffusion coefficients have been measured for aqueous MnCl2 and CdCl2 solutions from 0.004 to 4.93–5.00 mol-dm–3 (M) at 25°C. Diffusion coefficients for MnCl2 decrease to a minimum, rise to a maximum, and then decrease rapidly; such behavior is typical for strong electrolytes. In contrast CdCl2 diffusion coefficients decrease continuously with concentration; similar behavior is known for certain other associated electrolytes. Since thermodynamic diffusion coefficients for both salts are qualitatively similar, diffusion differences may be primarily due to thermodynamic rather than mobility factors. Isopiestic data were measured for CdCl2 from 1.79 to 7.29 mol- (kg H2O)–1, and critically compared to other isopiestic and emf data for CdCl2. Higher quality emf data are completely consistent with isopiestic data. Recommended smoothed values of activity coefficients, osmotic coefficients, water activities, and activity derivatives are given for CdCl2 at 25°C.Work performed under the auspices of the Office of Basic Energy Sciences (Geosciences) of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract number W-7405-ENG-48. |
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Keywords: | MnCl2 CdCl2 aqueous solutions diffusion coefficients osmotic coefficients activity coefficients |
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