62. Solving a chemistry problem

62. Solving a chemistry problem

615. Determine the molar mass and aggregation number of micelles of dodecyl ammonium chloride C12H25NH33Cl (the number of surfactant molecules in one micelle) in aqueous solutions of 0.15 mol/l at 30 C according to the following turbidity data:
s, g/l 3.30 4.80 5.92 7.8 9.16 10.00
τ*103, m-1 353 558 700 919 1076 1176
It is known that CMC is 1.01 g/l, the turbidity of the solution is 5.57*10-3 m-1 at CMC. Other data: light wavelength 436 nm, light refractive index in solvent 1.3336, refractive index increment Δn/Δс = 0.160 cm3/g.

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