4. Check whether the Duclos-Traube rule is fulfilled for dilute solutions of saturated organic acids, the surface tension of which at 298 K is:
Surfactant Caprylic acid
CH3(CH2)6COOH Capric acid CH3(CH2)8COOH
Concentration, mol/m3 0.0730 0.0097
Surface tension, mJ/m2 70.6 70.1
The surface tension of pure water at 298 K is 71.96 mJ/m2.

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