When sodium dodecyl sulfate (SDS) is added to water each detergent molecule is i

Question

When sodium dodecyl sulfate (SDS) is added to water each detergent molecule is initially dissolved in the water. As more SDS is added to the water, a point is reached at which the SDS molecules form micelles. This critical micelle concentration is 8.2 mM. The average molecular weight of the micelles (the sum of the constituent SDS molecules) is 18300. Given this information, calculate the number of detergent molecules in the average micelle. Enter your answer to the nearest ones; also, the MW of SDS (minus the sodium ion) is 265.38.

Explanation / Answer

The molecular weight is SDS is = 265. 38

The average molecular weight of the micelles (the sum of the constituent SDS molecules) is = 18300.

The number of detergent molecules in the average micelle = 18300/ 265. 38 = 68. 95 = 69 molecules per micelle (approximately).

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