A kinetic and isotope study of the mechanism of decomposition of the tetraperoxochromate(V) ion in basic solution
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Add time:08/14/2019 Source:sciencedirect.com
The decomposition of K3CrO8 in aqueous alkaline solution has been reinvestigated. Over the pH range from 8.0 to 11.2, the rate is first-order each in tetraperoxochromate ion and hydrogen ion concentrations. No evidence was found for any rate effect due to carbonate or phosphate buffer. Inhibition by H2O2, NH3 and by ethylenediamine occurs; the nature of these rate retardations was studied. Isotope labelling of the peroxide oxygen atoms showed that all of the oxygen atoms in product O2 originated as peroxide oxygens in the anions, and that small but real amount of scrambling occurs. The marked complexities which obtain in this systems are discussed in terms of the kinetic and isotope data.
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