112. Solving a chemistry problem

112. Solving a chemistry problem

Determine the molar mass and aggregation number of micelles of dodecylammonium chloride C12H25NH3Cl (molecular weight 221.80 g/mol) in aqueous solutions of 0.01 mol/l at 30°C from the following turbidity data:
s, g/l 3.20 4.10 5.10 6.10 7.35 8.15 10.15 12.15
τ*103, m-1 12.00 21.13 29.04 34.84 40.41 43.32 49.46 54.36

It is known that the CMC is 2.72 g/l, the turbidity of the solution at CMC is 5.57*10-3 m-1. Other data: light wavelength 436 nm, light refractive index in solvent 1.3320, refractive index increment Δn/Δс = 0.161 cm3/g.

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