9. Based on the data on the dependence of the surface tension of aqueous solutions of surfactants on concentration at a temperature of 293 K (Table 1), complete the following tasks:
• calculate, using the analytical method, the value of Gibbs adsorption G;
• plot the adsorption isotherm;
• plot the surface tension isotherm σ=f(C) and determine the value of surface activity;
• perform a graphical differentiation of the surface tension isotherm and calculate the value of adsorption;
Draw conclusions about the accuracy of the analytical and graphical methods for calculating the adsorption value G.
Option 9
Surfactant 1,2-Ethanediol HOCH2CH2OH
Concentration C*103, kmol/m3 0.000 0.400 0.800 1.500 2.500 3.000 5.000 6.500
Surface tension 6*103, J/m2 72.75 70.00 68.50 67.51 66.50 66.00 65.00 64.50

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