Abstract
The density of aqueous solutions of LiF, NaF, or KF, at room temperature, is measured as a function of the concentration. The measurements, together with corresponding data available on other alkali halides, are used to illustrate the concentration dependence of the apparent molar volume of the electrolytes in aqueous solution.
The data is in accordance with the conception that an essential, negative contribution to the volume is due to a progressive hydration of the ions upon dilution (i.e. with increasing water concentration).
The peculiar behaviour of the Li+-salts, compared with the other alkali halides, is associated with the small size of the Li+-ion compared with a water molecule.
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Pedersen, T.G., Dethlefsen, C. & Hvidt, A. Volumetric properties of aqueous solutions of alkali halides. Carlsberg Res. Commun. 49, 445–455 (1984). https://doi.org/10.1007/BF02907785
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DOI: https://doi.org/10.1007/BF02907785