
International Journal of Chemical Kinetics p. 1055 - 1064 (1995)
Update date:2022-08-29
Topics:
Ziglio, Claudio Marcos
Takashima, Keiko
The oxidation kinetics of malic acid by vanadium(V) in aqueous sulphuric acid was investigated at 303 K by monitoring the appearance of vanadium(IV) at 760 nm.The reaction showed first-order behavior with respect to vanadium(V), malic acid, and hydrogen ion concentration, respectively, regardless of the ionic strength.The reaction rate is enhanced by an increase in ionic strength and a decrease of the dielectric constant of the medium by addition of methanol.The activation parameters were estimated by varying the temperature in the range of 293 K to 313 K.An oxidation mechanism is proposed, involving different vanadium(V) species produced in the presence of sulphuric acid.
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