Partial molar volumes of tetraalkylammonium hydroxides in aqueous solution at 25°C |
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Authors: | C Klofutar D Rudan-Tasic V Mancic-Klofutar |
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Institution: | (1) Biotechnical Faculty, Department of Food Technology, University of Ljubljana, SI-1000 Ljubljana, Slovenia |
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Abstract: | The densities of aqueous solutions of tetramethylammonium, tetraethylammonium, tetra-n-propylammonium and tetra-n-butylammonium hydroxide have been measured at 25°C in the concentration range 0.1–1.0 mol-kg-1 . The apparent and partial molar volumes are calculated from the density measurements. The apparent molar volumes of the
solutes show considerable deviation from the Debye-Hülckel limiting law, even at high dilution. The relation for the concentration
dependence of the apparent molar volume is given in an analytical form. The limiting apparent molar volumes of the solutes
are split into their ionic components by an extrathermodynamic approach and are discussed in terms of ion-solvent interactions.
In this way, the limiting partial molar ionic volume for the hydroxide ion is found to be 2 cm3-mol-1. |
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Keywords: | Apparent molar volume partial molar volume partial molar ionic volume ion-solvent interaction |
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