2. Based on the available experimental data on the dependence of the surface tension of aqueous surfactant solutions on the concentration (sodium 8-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 2.0 3.0 4.0
b, mJ/m2 72.8 55.6 53.0 49.9 45.1 41.4 36.7 31.2 29.8 29.6

Determine the surface activity and calculate the amount of excess adsorption of an aqueous surfactant solution at a concentration of 0.05 mmol/l.

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