94. Solving a chemistry problem

94. Solving a chemistry problem

621. Determine the molar mass and aggregation number of micelles of tetradecyl trimethyl ammonium chloride C14H29N(CH3)3Cl (the number of surfactant molecules in one micelle) in aqueous solutions of 0.02 mol/l NaCl at 23 °C using the following turbidity data:
C, g/L 1.05 1.66 2.2 2.82 3.44 4.07 4.98 5.65
τ*103, m-1 10.1 17.0 22.7 28.3 32.6 37.2 42.7 45.2
It is known that the CMC is 0.70 g/l, the turbidity of the solution at CMC is 5.24*10-3 m-1. Other data: light wavelength 436 nm, light refractive index in solvent 1.333, refractive index increment Δn/Δс = 0.157 cm3/g.

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