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The solubilities of sodium soaps of odd carbon-number fatty acids were measured at various temperatures and the Kraft points of the soaps were determined from the phase diagrams showing the temperature dependence of equilibria among monomers, micelles, and hydrated solid. It was found that the Kraft points were related with the carbon numbers of the fatty acids in a zig-zag curve.
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Ogino et al. (1976) studied this question.
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