In general,for soaps,the concentration of surfactant at $CMC$ is around $mol \ L^{-1}$.
- A$10^{-4}$ to $10^{-3}$
- B$10^{-4}$ to $10^{-1}$
- C$10^{-7}$ to $10^{-4}$
- D$10^{-4}$ to $10^{+2}$
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