Abstract
WE have recently shown1, by a thermodynamical procedure, how the standard free energy of adsorption of a solute on to a solution/air interface (δ G°) may be obtained from the limiting slope α at low concentrations of the surface tension-concentration curve. This is given by the equation where α is—(dy/dc)c=0 and δ is the thickness of the surface layer, which was identified with the most probable length of the adsorbed molecule. The standard states in bulk and on the surface are hypothetical states in which the solute is at unit activity in each (activity is expressed in molality units), but essentially have all the properties of infinitely dilute solutions.
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References
Ward and Tordai, Trans. Farad. Soc., 42, 413 (1946).
Rehbinder, Z. Phys., 52, 641 (1924).
Ward, Trans. Farad., 42, 339 (1946).
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WARD, A., TORDAI, L. Standard Entropy of Adsorption. Nature 158, 416 (1946). https://doi.org/10.1038/158416a0
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DOI: https://doi.org/10.1038/158416a0
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