1. Based on the available experimental data on the dependence of the surface tension of aqueous solutions of acetone on concentration (t = 15 C), construct a Gibbs adsorption isotherm
Spav, mol/l 0 0.01 0.02 0.03 0.06 0.1 0.2
b, mJ/m2 73.5 72.4 71.5 70.7 68.8 66.8 63.5
Determine the surface activity and calculate the amount of excess adsorption of an aqueous solution of the specified surfactant at a concentration of 0.06 mol/l.

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