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Why is the concentration of pyrene used to determine CMC for SDS so much greater than...

Why is the concentration of pyrene used to determine CMC for SDS so much greater than the corresponding concentration used for determination of this value for RL?
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Answer #1

Pyrene is an organic poly cyclic aromatic compound and SDS is a sodium salt of sulphate (a type of detergent). As you know detergent is unable to form micelles in hard water, the same concept is applied here. Large concentrations are required to make CMC. On the other hand RL is a solution of sodium lactate it also contain CaCl2, NaCl and KCl. Ca2+ in makes Micelles easily than reactive metals therefore it require less concentration.

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