Collect. Czech. Chem. Commun. 1985, 50, 1588-1593

Kinetics of redox reaction of lactic acid with bromate ions, and Belousov-Zhabotinskii oscillator with lactic acid

Ľubica Adamčíková and Irena Halinárová

Department of Physical Chemistry, Comenius University, 842 15 Bratislava


The kinetics and mechanism of the redox reaction of bromate ions with lactic acid was studied in the medium of sulphuric acid. The reaction is of first order with respect to both reactants. The dependence of the measured rate constant on the concentration of hydrogen ions was analysed and the activation parameters of the reaction were determined. Based on the experimental kinetic data, the probable mechanism is discussed. Oscillations of bromine and catalyst are observed in the system KBrO3-CH3CHOHCOOH-H2SO4-MnSO4 if the solution is bubbled with nitrogen. The dependence of the induction period and oscillation period on the concentration of the reactants was evaluated.