k = 1.62 X 10-2 sec-1 at 25", log A = 9.51 =t 0.79, and E, = 15.4 & 1.0 kcal/mol. 6+ Fe is Fe02-and all oxygens are kinetically equivalent. celerated by dilute acid. HzO, HzOZ, and SO?-, and the results are compared with other strong oxidizing agents. and S03*-are quantitative and show simple stoichiometry. in S032-, but oxygen transfer from Fe042-to the product (02 or S042-) occurs only in the latter case.In basic media the rate of 1 8 0 exchange between Fe042-and water follows the law R = k[FeO4*-1, whereIn aqueous media the ion of Both water exchange and water oxidation are ac-Stoichiometric, kinetic, and 1 8 0 studies have been applied to the reaction of Fe02-withThe reaction with HZOZ The reactions are first order in Hz02 and second order ethods for preparing and analyzing potassium M ferrate, K2Fe04, of high purity (97-9973 have existed for some time, but little is known about its aqueous chemistry. K2Fe04(s) is usually prepared by strongly basic media and isolated from saturated KOH ~o l u t i o n .~-~ Electrolytic means may also be used.5Analysis consists of the oxidation of Cr(lI1) in basic media followed by titration of the Cr(V1) formed with Oc1-oxidation of freshly prepared iron hydroxide in (2) H.
(2), 1.653 (1) and 1.656 (2) A. The thermally corrected bond lengths, using the rigid-body model, are 1.660(2), 1.667 (1) and 1.671 (2)A respectively. These are slightly longer than those in the isomorphous K2CrO 4 and KzMnO 4.
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