Question

The critical micelle concentration $(CMC)$ is defined as

• A. the concentration at which micellization starts
• B. the concentration at which micelle starts behaving like an electrolyte
• C. the concentration at which dispersed phase is separated from dispersion medium
• D. the concentration at which a colloid is converted to suspension.

Answer 1

Answer: (A)

Associated colloids are some substances which at low concentrations behave as normal strong electrolytes, but at higher concentrations exhibit colloidal behaviour due to the formation of aggregates.
The aggregated particles thus formed are called micelles.
The formation of micelles takes place only above a particular temperature called Kraft temperature and above a particular concentration called critical micelle concentration (CMC).