Author Retains CopyrightCheong, Heng Nian2011-03-162022-10-252011-03-162022-10-2519741974https://ir.wgtn.ac.nz/handle/123456789/23382A non-buffer method is used for kinetic investigation of the bromate-iodide and iodate-iodide reactions in pH region between 3.000 and 4.000. The fifth order rate law for uncatalysed iodate-iodide reaction is found to hold in this pH region in a nitrate medium with unit ionic strength at 25°C. k0 is found to be 2.2±0.2x10 8 mol-4dm-12s-1. For the uncatalysed bromate-iodide reaction a change in rate law is observed. The rate law found in the present work is in nitrate medium with unit ionic strength at 25°C. The values of k0, k1 are 42±3 mol-3dm-9s-1 and 0.0112±0.0006 mol-2dm-6s-1 respectively. The mechanism for the new rate law for the uncatalysed bromate-iodide reaction is also discussed.pdfen-NZhttps://www.wgtn.ac.nz/library/about-us/policies-and-strategies/copyright-for-the-researcharchiveBromidesChemical kineticsIodidesTextAll rights, except those explicitly waived, are held by the Author