Excess molar volumes of formic acid + water acetic acid + water and propionic acid + water systems at 288.15, 298.15 and 308.15 K |
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| Institution: | 1. Dipartimento di Fisica, Università degli Studi di Pavia & INFN, Sezione di Pavia, Via Bassi, 6, I-27100 Pavia, Italy;2. Fakultät für Mathematik, Universität Regensburg, D-93040 Regensburg, Germany;3. Mathematisches Institut, Universität Freiburg, 79104 Freiburg, Germany;4. DISIM - Department of Information Engineering, Computer Science and Mathematics, University of L''Aquila, Via Vetoio 1 (Coppito), 67100 L''Aquila (AQ), Italy |
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| Abstract: | Densities and excess molar volumes were determined in the formic acid + water, acetic acid + water and propionic acid + water systems at 288.15, 298.15 and 308.15 K. The results are satisfactorily described using the ideal association model of the type A + B + A2 for the system with formic acid. The Mecke—Kempter model is adequate for the acetic acid + water and propionic acid + water systems. In both models the formation of open dimers and open higher associates is postulated for the self-association of carboxylic acids in water. |
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