Surface Chemistry - Result Question 22

####23. Among the following, the surfactant that will form micelles in aqueous solution at the lowest molar concentration at ambient conditions, is

(2008,3M)

(a) CH3(CH2)15N+(CH3)3Br

(b) CH3(CH2)11OSO3Na+

(c) CH3(CH2)6COONa+

(d) CH3(CH2)11N+(CH3)3Br

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Answer:

Correct Answer: 23. (a)

Solution:

  1. Larger the hydrophobic fragment of surfactant, easier will be the micellisation, smaller the crticial micelle concentration. Therefore, CH3(CH2)15N+(CH3)3Brwill have the lowest crticial micelle concentration.


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