Abstract
Surface tension and surface potential measurements have been made as functions of concentration and temperature for a homologous series of normal aliphatic alcohols. The results are fitted to a two-dimensional equation of state and the surface tension measurements are checked for consistency with the corresponding surface potential results. From the temperature dependence of the surface tension the quantities Δ H 0. Δ S 0, and Δ G 0 for the adsorption process are calculated. These results are correlated with corresponding solution thermodynamics. The molecular configuration in the surface has been tentatively deduced. The surface phase more closely resembles the bulk solution than the vapor. The negative entropy of adsorption from the vapor is very large and it is suggested that the additional factors responsible for the high values are changes in internal degrees of freedom of the hydrocarbon portion of the molecule, and “cluster” formation in the water in the immediate neighborhood of the solute molecule.
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