Abstract
A mechanism is presented that explains the full range of dynamics exhibited in the oxidations of iodide ion by
both bromine(III) (bromite) and bromine(V) (brómate) in closed and open reactors, including clock reactions and oscillations. This comprehensive model comprises 28 steps and 14 species, includes IBr as a reactive
intermediate, and contains a reaction sequence autocatalytic in HOBr. Kinetics curves and phase diagrams simulated with this model show very good agreement with experiment. The combined model is based on a 20-step mechanism used to explain the bromine(III)-iodide clock reaction over the pH range 6-8. With additional independent species and bromine(V)-driven steps, simulations of bromine(V)-iodide oscillations in concentrated sulfuric acid are improved by this model compared with the previous model.