Ultrasonic vibration potentials,apparent molal volumes,and apparent molal heat capacities of 1:1 electrolytes in acetonitrile |
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Authors: | Raoul Zana Gérald Perron Jacques E Desnoyers |
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Institution: | (1) Centre de recherche sur les Macromolécules, CNRS, 67083 Strasbourg-Cedex, France;(2) Department of Chemistry, Université de Sherbrooke, JIK 2R1 Sherbrooke, Quebec, Canada |
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Abstract: | The ultrasonic vibration potentials and apparent molal volumes for many inorganic and organic electrolytes were measured in acetonitrile at 25°C and combined to obtain ionic contributions to the standard partial molal volumes V°(ion). Monatomic cations and anions of the same size essentially have the same V°(ion). Their size dependence can be interpreted through Hepler's equation. The apparent molal heat capacities were also measured in acetonitrile and used to derive standard values. Various methods of estimating C
p
0
(ion) were investigated and an ionic scale is proposed. It is concluded that C
p
0
(ion) of large organic ions are very close to the intrinsic heat capacities of the ions, and the solvation contribution to monatomic ions is positive for both cations and anions. |
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Keywords: | Volumes apparent molal heat capacities apparent molal ultrasonic vibration potential acetonitrile electrolytes |
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