8. Draw the Gibbs adsorption isotherm using the surface tension value of sodium threedecyl

sulphate aqueous solutions at 293 K. Calculate the surface activity of this surfactant and

critical micelle concentration (GH20-72,75_mJ/m²).

0,05

0,1

1,0

2,0

5,0

53,8 46,9

Csurfactant. 0,005 0,01

mmol/1

72,2

0₂

mJ/m²

72

71,5

71,0

0,5

65,5

60,3

3,0

41,9