273. Determine the ability for spontaneous spreading over heptane of an aqueous solution of a quaternary ammonium salt of perfluoropelargonic acid, if the surface tension of heptane is 21.1 mN/m. the surface tension of a solution of a quaternary ammonium salt of perfluoropelargonic acid is 20.1 mN/m. interfacial tension at the interface between the surfactant solution and heptane is 3.1 mN/m.

If you do not open the file - install the RAR archiver. Inside the archive you will find a solution in Word format.