AP EAMCET202125 Aug 2021Evening ShiftChemistrySurface ChemistryActual
In general, for soaps, the concentration of surfactant at CMC is around mol L ⁻¹ .
Options
- A10⁻⁴ to 10⁻³
- B10⁻⁴ to 10⁻¹
- C10⁻⁷ to 10⁻⁴
- D10⁻⁴ to 10⁺²
Correct answer
A. 10⁻⁴ to 10⁻³
Step-by-step solution
CMC is defined as concentration of surfactants above which micelles form and all additional surfactants added to the system will form micelles. Concentration of surfactant is nearly 10⁻⁴ to 10⁻³ ~mol ~L ⁻¹ at CMC. CMC depends on temperature, pressure and concentration of other surface, active substances and electrolytes.