19. Show that the adsorption of 1,4-butanediol on the surface of its aqueous solutions obeys the Langmuir equation and find graphically the constants of this equation using the following data:
s, mol/l 0.5 1.0 1.5 2.0 2.5
А*106, mol/m2 0.985 1.667 1.977 2.239 2.362

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