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Vol. 37 No. 12 (2025): Vol 37 Issue 12, 2025

Copyright (c) 2025 Oinam Gobin Singh

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Micellization of Sodium Octylsulfate with Sodium Salt of Ibuprofen in Aqueous Sodium Chloride

https://doi.org/10.14233/ajchem.2025.34732
Oinam Gobin Singh
Department of Chemistry, Oriental College, Takyel Khuraijam Leikai, Imphal-795001, India
https://orcid.org/0009-0007-8264-625X

Corresponding Author(s) : Oinam Gobin Singh

oinamgobinsingh@yahoo.com

Asian Journal of Chemistry, Vol. 37 No. 12 (2025): Vol 37 Issue 12, 2025

Abstract

Conductance measurement was performed for mixtures of sodium octylsulfate (SOS) with sodium salt of ibuprofen (IBF) at 25 ºC both in absence and presence of sodium chloride. The experimental critical micelle concentration (CMC) values indicate non-ideal behaviour with synergism. Mutual interaction parameter (βM) and composition (xSOS) in the mixed micelle were calculated using Rubingh’s model. The attractive interaction between the components in the mixed micelle decreases with increase in the NaCl concentration. The calculated micellar mole fraction values indicate predominance of the mixed micelle with SOS. The slope ratio method was used to calculate the counterion binding constant for both the pure and mixed systems. The Corrin–Harkins equation was found to be inapplicable to the systems studied. The Gibbs free energy of micellization (ΔGºmic) was also calculated and the values indicate the formation of stable micelles. The addition of NaCl was observed to thermodynamically enhance the micellization process.

Keywords

Sodium octylsulfate Ibuprofen Critical micelle concentration Interaction parameter Counterion binding constant
(1)
Singh, O. G. Micellization of Sodium Octylsulfate With Sodium Salt of Ibuprofen in Aqueous Sodium Chloride. ajc 2025, 37, 3036-3042.
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