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- W2048476918 abstract "The bromate-bromide reaction was investigated in an acidity range not studied yet. The reaction was followed at the Br2/Br3- isosbestic point (lambda = 446 nm). It was observed a first-order behavior for bromate and bromide ions and a second-order behavior for H+ ion that results in the rate law nu = k[BrO3-][Br- ][H+]². This rate law suggests a mechanism involving two successive protonation of bromate followed by the interaction of the intermediate species H2BrO3+ with bromide. These results disagree with the obtained by other authors who observed a second-order behavior for the bromide and first-order for H+, and have proposed intermediate species like H2Br2O3 and HBr2O3-. The second-order for [H+] observed in the range 0.005 <= [H+] <= 2.77 mol L-1 sets down that the pKa of bromic acid, HBrO3, must be lower than -0.5 (T = 25 °C), different from all other values for this pKa proposed in the literature." @default.
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- W2048476918 date "2001-12-01" @default.
- W2048476918 modified "2023-10-10" @default.
- W2048476918 title "Revisiting the Kinetics and Mechanism of Bromate-Bromide Reaction" @default.
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- W2048476918 doi "https://doi.org/10.1590/s0103-50532001000600014" @default.
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