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Abstract
The self-association of ethanol diluted in CCl4 has been studied by IR spectroscopy. Three OH stretching bands were assigned to monomers, linear dimers, and linear multimers. The self-association was described with two equilibrium constants, one for the formation of dimers, K2, the other for the formation of multimers, KA. These equilibrium constants were determined for ethanol concentration ranging from 0.19 to 0.76 mol L-1 by using a method developed by Coggeshall and Saier. At T = 25 °C, K2 was found to be equal to 1.08 L mol-1 in terms of molar concentration or 18.4 in terms of molar fraction; KA was found to be equal to 3.52 L mol-1 in terms of molar concentration or 60.0 in terms of molar fraction. The enthalpy of formation for K2 was found to be equal to −4.61 kcal mol-1 and to −4.15 kcal mol-1 for KA.
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