12. Determine the surface activity of acetic ethyl ether from the given values of the surface tension of its aqueous solutions at 298K.
Plot the Gibbs adsorption isotherm.
С, mmol/l 7.8 15.6 31.2 62.5 123 250
σ, mJ/m2 69.6 68.0 65.7 61.5 56.2 49.7
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