2. Based on the available experimental data on the dependence of the surface tension of aqueous solutions of surfactants on the concentration (sodium 7-hexadecyl sulfate, t=20 C), construct a Gibbs adsorption isotherm.
Spav, mmol/l 0 0.05 0.1 0.15 0.3 0.5 1.0 1.5
b, mJ/m2 72.8 54.8 51.9 48.9 44.0 40.4 35.7 31.5

Determine the surface activity and calculate the amount of excess adsorption of an aqueous surfactant solution at a concentration of 0.5 mmol/l.

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