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
$(2008,3 M)$
(a) $CH _3\left(CH _2\right) _{15} N^{+}\left(CH _3\right) _3 Br^{-}$
(b) $CH _3\left(CH _2\right) _{11} OSO _3^{-} Na^{+}$
(c) $CH _3\left(CH _2\right) _6 COO^{-} Na^{+}$
(d) $CH _3\left(CH _2\right) _{11} N^{+}\left(CH _3\right) _3 Br^{-}$
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Answer:
Correct Answer: 23. (a)
Solution:
- Larger the hydrophobic fragment of surfactant, easier will be the micellisation, smaller the crticial micelle concentration. Therefore, $CH _3\left(CH _2\right) _{15} N^{+}\left(CH _3\right) _3 Br^{-}$will have the lowest crticial micelle concentration.
