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<< JRScience Home   Volume 11 No.1 June 2000 << Back to Volume Home

Interaction Studies of Tween-40 with some Acidic Species at 20 C

Farzana Mahmood, Muhammad Arif, Ayyaz Ahmad and Shahida B.Niazi
Department of Chemistry, Bahauddin Zakariya University, Multan, Pakistan.

Abstract: Interactions of tween-40 (polyoxyethylene-20-sorbitain monopalmitate) with acetic acid, chloroacetic acid, o-, m-, p-nitrophenols and picric acid have been described at 20 C using conductivity method. The studies are preformed at cmc with an emphasis on pre- and post micellar regions. Data thus obtained is used to manipulate the interactions. Binding constants of the species have been computed using Satake equation, standard free energy changes are also obtained to further justify the results.

Keywords: Association constants, Surfacetants, Acidic species, Satake equation, Conductometry