3. Based on the given data for the surface tension of aqueous solutions of acetic ethyl ether at 295 K, plot the Gibbs adsorption isotherm:
С, mol/l 0.008 0.015 0.031 0.062 0.125 0.250
σ*103, J/m2 69.6 68.0 65.1 61.5 56.2 49.7
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