The initial rate of the reaction of I03-with Iin acetate buffer has been measured at fixed ionic strength and acetate concentration with varying concentrations of I03-, I-, and H+ at temperatures between 293 and 308°K. The method involves spectrophotometic determination of the product I3_ at a wavelength of 353 nm. In contrast to some previous results, the reaction is now found to be first order in I03" and second order in H+; the apparent order with respect to Iincreases with temperature in the concentration ranges considered. Agreement with some earlier amperometric results is found. The applicability of previously proposed rate laws and mechanisms is considered, and upper limits are estimated for the enthalpies of possible reactive intermediates.

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Die Reaktionsgeschwindigkeit der Reaktionen A und B von JO3(‐) mit J(‐) in acetatgepufferten Lösungen bei gleicher Ionenstärke und wechselnden Konzentrationen von JO3(‐), J(‐) und H(+) bei Temperaturen zwischen 293 und 308 K wird spektrophotometrisch bestimmt.

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