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Micelles are formed from concentrated so...

Micelles are formed from concentrated soap solutions above critical micelle concentration. Micelles are regarded as associate colloids as soap ions associate to give micelles.   
Concentration of uniform 'micelle’ particles at CMC of a surfactant solution is 0.004M. Charge carried by each micelle is `4 xx 10^(-17)` coloumbs. What is the molar concentration of the surfactant (soap) at CMC ? 

A

`1M`

B

`0.5 M`

C

`0.2 M`

D

`0.3 M`

Text Solution

Verified by Experts

The correct Answer is:
A
Micelle conc - 0.004 M , charge `1.6 x x10^(-19)C rarr 1` stearate ion
`4 xx 10^(-17) rarr ? "     " 250`
In each micalle no. of sterate ions = 250 . Then molar conc `0.004 xx 250 = 1M`.
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