4. Table 1.6 shows the dependence of surface tension on the concentration of the surfactant solution. Determine the area occupied by a surfactant molecule in the saturated adsorption layer and the thickness of the adsorption layer. The density of the surfactant is considered equal to p = 0.95 g/cm3.
Surface tension of aqueous solutions of surfactants at 20 C
Option 4
C16H33SO4Na 0.00 0.001 0.005 0.010 0.050 0.100 0.15 0.25 0.30 0.50 1.00 2.00 3.00
C*103? J/m2 72.75 71.80 69.90 67.00 52.70 46.40 41.50 37.25 37.20 37.10 37.00 37.00 36.90
b*103? mol/l

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