The counter-ion activity coefficient of sodium alkyl sulfate with chain length from C8 to C14 was determined in aqueous solutions and in the presence of added magnesium ion. The degree of association of sodium ion to the micelle (β) can be deduced from the concentration dependence of the counter-ion activity. The value of β so determined in the presence of magnesium ion was confirmed to decrease rapidly as the relative concentration of magnesium ion increases. The observed change of counter-ion activity with concentration was found to be interpreted in terms of a lameller micelle model.
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Satake et al. (1969) studied this question.
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