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Micellar Catalytic Oxidation of Ascorbic Acid by Potassium Dichromate

Author Affiliations

  • 1 Al-Aqsa University, Chemistry Department, GAZA STRIP, PALESTINE

Res.J.chem.sci., Volume 4, Issue (6), Pages 82-89, June,18 (2014)

Abstract

The kinetic oxidation of ascorbic acid; vitamin C; (H3As) by Potassium dichromate (Cr2O72-) has been investigated spectrophotometrically at λ = 360 nm in aqueous and in the presence of 10 mM of both an anionic surfactant sodium dioctylsulfosuccinate (AOT) and cationic surfactant cetyltrimethylammonium bromide (CTAB) at pH = 8 and temperature = 25C. The reaction followed first-order kinetics with respect to [H3As] and [Cr2O72-]. The kobs values are found to be independent on pH values lower than pH = 6 and higher than pH = 9. Increased cationic CTAB concentration found to increase kobs values whereas those of AOT decrease the kobs values. The effect of added anions, such as chloride, bromide, and iodide has been studied and discussed. The activation parameters ΔH* and ΔS* were also evaluated.

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