K176. Plot the Gibbs adsorption isotherm using the surface tension values of aqueous solutions of sodium dodecyl sulfate at 20 0C:

Surfactant, mmol/l 2.16 3.96 6.6 8.3 9.3 9.8 10.2 11.2
σ, mJ/m2 62 54 47 43 42 41 41 41
Determine the surface activity of this surfactant and the critical micelle concentration.

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