7. When measuring the difference in refractive indices of aqueous solutions of sodium dodecyl sulfate and water, the following data were obtained:
C*103, mol/l 9.1 9.38 9.54 9.78 10.02 10.26 10.50
Δn - - 16.6 17.1 17.7 18.0 18.3
Determine the CMC.

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