Isentropic compressibilities of alcohol-water mixtures at 25°C |
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Authors: | Jaime Lara Jacques E Desnoyers |
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Institution: | (1) Department of Chemistry, Université de Sherbrooke, J1K 2R1 Sherbrooke, Quebec, Germany |
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Abstract: | The sound velocities of aqueous solutions of methanol, ethanol, 2-propanol, tertbutanol and 2-butoxyethanol (BE) were measured over the whole mole fraction range at 25°C. The isentropic apparent and partial molar compressibilities, K,S and S,A were derived from these data. In the case ofBE, the isothermal partial molar compressibilities were also calculated. K,S and S,A for all alcohols except BE initially decrease slightly with the mole fraction and then increase sharply, especially with the higher members, to the value of the pure liquid. In the case of BE, K,S and S,A do not go through an initial minimum and the latter goes through a sharp maximum. The compressibilities of water in these mixtures are significantly lower than those of pure water itself. These data can be correlated with other properties and are consistent with the existence of microphase transitions in these aqueous organic mixtures. |
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Keywords: | Alcohols methanol ethanol 2-propanol tert-butanol 2-butoxyethanol ultrasonic velocities compressibilities |
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