Abstract
The effect of chloride ions on the kinetics and mechanism of the copper-catalysed oxidation of ascorbic acid by dissolved oxygen has been examined over the pH range 2.0–3.5 and chloride concentrations up to 0.2 mol dm–3. The empirical rate law has been established as – d[O2]/dt=kobs.[O2]½ over the whole range. At constant total ascorbate, total copper, and hydrogen ion concentrations, the general relationship (1) was obtained. The constants kobs.= [graphic omitted] (1)A to E were evaluated using data obtained in pure nitrate media to fix A and C, and the dependence of all the constants on pH, total copper concentration, and total ascorbate concentrations established experimentally. It is also pointed out that a mechanism based on the involvement of copper(I) rather than the copper(III) invoked by us cannot be entirely ruled out.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of the Chemical Society, Dalton Transactions
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
