Question

Molar conductivity of strong electrolyte below critical micelle concentration

Answer 1

Critical micelle concentration. The CMC is an important characteristic of a surfactant. Before reaching the CMC, the surface tension changes strongly with the concentration of the surfactant. After reaching the CMC, the surface tension remains relatively constant or changes with a lower slope.

Answer 2

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As the concentration of sodium stearate increases beyond CMC, stearate ions get clubbed together and form micelles. This abruptly causes the concentration of the current carrier anions to decreases. This is reflected by the sharp change in ∧m at CMC, followed by a greater rate of decrease of ∧m with√C.