Apparent Molar Volume and Apparent Molar Expansibility of Rubidium, Cesium, and Ammonium Cyclohexylsulfamate in Aqueous Solution |
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Authors: | Cveto Klofutar Jaka Horvat Darja Rudan-Tasic |
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Institution: | (1) Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia |
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Abstract: | Summary. The apparent molar volume of rubidium, caesium, and ammonium cyclohexylsulfamate was determined from the density data of their
aqueous solutions at 293.15, 298.15, 303.15, 313.15, 323.15, and 333.15 K. From the apparent molar volume, determined at various
temperatures, the apparent molar expansibility was calculated. The limiting apparent molar volume and apparent molar expansibility
were evaluated and apportioned into their ionic components. The limiting partial molar ionic volumes and expansibilities are
discussed in terms of the various effects of the ion in solution on the structure of water. It was shown that the limiting
partial molar ionic expansibilities of the alkali-metal cations increase with their ionic radii. The coefficients of thermal
expansion of the investigated solutions at 298.15 K were calculated and are presented graphically together with some alkali-metal
cyclohexylsulfamates and tetramethylammonium cyclohexylsulfamate. The densities of the investigated solutions can be adequately
represented by an equation derived by Redlich. |
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Keywords: | , Density data, Expansibility, Cyclohexylsulfamates, Aqueous solution, |
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