2a. SDS forms spherical micelles with an aggregation number N~ 57 amphiphiles. The radius of the micelle is about 20A. The headgroups of SDS are highly charged, and a sulfate anion headgroup has an approximate net charge of -1.9 x10-¹9C (Coulombs). The headgroups are about 0.9 nm apart on the surface of the micelle.
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