Question

Why the cmc obtained by surface tension is different from cmc of conductivity measurements?

Answer 1

In most situations , such as surface tension measurements or conductivity measurements ,the amount of surfactant at the interface is ineligible compared to that in the bulk in CMC.

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Answer 2

Below the CMC the surface tension decreases with increasing surfactant concentration as the number of surfactants at the interface increases. Above the CMC, in contrast, the surface tension of the solution is constant because the interfacial surfactant concentration does not change any more.