Summary Solubilization data have been obtained for aqueous solutions of Na‐laurate, K‐ laute, dodecylamine‐HCL, Tween 20, Span 20, N‐dodecyl‐alanine‐HCl, Na‐oleate, Tergitol 4, and Ultrawet K, using the water insoluble dyes, Orange OT, and dimethylaminoazobenzene as the solubilized substances. Results indicate that the dye solubility method is fairly reproducible. Filtration of samples was found to be an important part of the technique. A slight excess of fatty acid or of alkali in Na‐ and K‐laurate solutions was found to have no appreciable effect on solubilization. In agreement with Kolthoff's but not with Mc‐Bain's findings, the Na‐ and K‐laurates were found to yield the same solubilization of either DMAB or Orange OT, indicating that the solubilizing species in solution depends upon the nature of the long chain ion. Agreement on solubilization for dodecylamine‐HCl with previous workers is poor. The present work indicates no solubilization below the critical micelle concentration. The apparent solubilization reported by Kolthoff was attributed to suspended dye. The use of solubilization data in the determination of critical micelle concentration is examined, and values are compared with previous works.
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Rigg et al. (1953) studied this question.