77. Determine the surface activity of a substance dissolved in water using the following data (20 C):
Substance Content in solution (C), mol/m3 b solution, mN/m
1 Caproic acid 1.0 71.2
2. Dodecylammonium sulfate 0.005 67.0
3. Potassium palmitate 0.2 58.5
Explain the manifestation of surface activity by these substances.

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