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7344

KINETICS AND MECHANISM OF OXIDATION OF L-ASCORBIC ACID BY CHROMIUM (VI)

Article

Last updated: 03 Jan 2025

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Tags

Chemistry

Abstract

The kinetics of oxidation of L-ascorbic acid by potassium chromate was studied as a function of pH, L-ascorbic acid concentration and temperature using the spectrophotometric technique. The rate of reaction is first order with respect to the concentration of each reactant and increases as [H+] increases. The kinetic data indicate involvement of the monoprotonated ascorbate species (HA-) in the redox process. A mechanism involving the formation of chromium (VI)- ascorbate intermediate is a rate-determining step followed by a redox step was suggested. The activation enthalpy and activation entropy changes for the reaction have been calculated to be ΔH*= 69 kJmol-1 and ΔS*= -209 JK-1 mol-1, respectively.

DOI

10.21608/absb.2010.7344

Keywords

Kinetics, Oxidation, L-ascorbic acid, Chromium (VI)

Authors

First Name

MOHAMED

Last Name

MANSOUR

MiddleName

A.

Affiliation

Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, Cairo, Egypt

Email

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City

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Orcid

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Volume

21

Article Issue

Issue 1-A

Related Issue

1398

Issue Date

2010-06-01

Receive Date

2010-01-10

Publish Date

2010-06-01

Page Start

189

Page End

198

Print ISSN

1110-2535

Online ISSN

2636-3305

Article File

ABSB_Volume 21_Issue Issue 1-A_Pages 189-198.pdf

PDF . 441.3kB

Link

https://absb.journals.ekb.eg/article_7344.html

Detail API

https://absb.journals.ekb.eg/service?article_code=7344

Order

13

Type

Original Article

Type Code

520

Publication Type

Journal

Publication Title

Al-Azhar Bulletin of Science

Publication Link

https://absb.journals.ekb.eg/

MainTitle

KINETICS AND MECHANISM OF OXIDATION OF L-ASCORBIC ACID BY CHROMIUM (VI)

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Article

Created At

22 Jan 2023