Abstract
The premicellar association and the formation of micelles in sodium n-octanoate (NaB) solutions have been investigated by potentiometric titration at constant sodium concentration [3 M Na(Cl)] and by light-scattering photometry in 3 M NaCl, NaBr and NaI. The potentiometric results were treated using the Letagropvrid method. The following stability constants were found: B − + H 2 O = HB + OH − − logβ 1,1 = 8.965 ± 0.019 5B − + H 2 O = HB 5 4− + OH − − logβ 1,5 = 2.196 ± 0.027 9B − + H 2 O = HB 9 8− + OH − − log& = − 1.267 ± 0.199 9B − = B 9 9− − logβ 0,9 = −7.963 max − 8.319. The data can be reconciled satisfactorily, however, with any micellar aggregation number between 9 and 17. The light-scattering measurements followed Huisman's method and yielded a micellar weight of 4.62 ± 0.05 kg mole −1. To reconcile this result with the potentiometric aggregation numbers it is necessary to assume that the micelle binds 6–10 molecules of water per octanoate molecule. This assumption is supported by other investigations.
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