Abstract
A simplified version of Harned's conductimetric technique has been used to measure binary diffusion coefficients of aqueous lithium, sodium, and potassium hydroxides at 25°C from 0.002 to 0.14 mol-dm−3. Because of the large difference in mobility between OH− and the cations, the electrophoretic effect tends to reduce the rate of diffusion of the alkali metal hydroxides; the largest effect is observed for LiOH solutions. The measured diffusion coefficients are in excellent agreement with predictions of the Onsager-Fuoss theory of ion transport. Precise activity coefficients determined from the diffusion measurements are compared with activity coefficients obtained previously by emf methods.
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Noulty, R.A., Leaist, D.G. Activity coefficients and diffusion coefficients of dilute aqueous solutions of lithium, sodium, and potassium hydroxides. J Solution Chem 13, 767–778 (1984). https://doi.org/10.1007/BF00647692
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DOI: https://doi.org/10.1007/BF00647692