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Kinetics of the Oxidation of Hypophosphorous Acid by Chromate
Author(s) -
Pan Kuan,
Lin ShengHsien
Publication year - 1960
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.196000017
Subject(s) - chemistry , chromate conversion coating , sulfuric acid , kinetics , inorganic chemistry , ion , order of reaction , first order , nuclear chemistry , reaction rate constant , organic chemistry , corrosion , physics , quantum mechanics , mathematics
The reduction of dichromate ion by hypoposphorous acid in sulfuric acid solution has been found to be of the second order with respect to HCrO 4 − and of the first order with respect to the total concentration of H 3 PO 2 . The existence of the active form of hypophosphorous acid and the intermediate state of HCr 2 O 6 − ion was presumed. From the mesurable rate of reaction, the reaction mechanism was proposed as follows:where HCr 2 O 6 − was rapidly reduced to Cr[III]. The average value of k 1 k 3 / k 2 was estimated as 466 at 25°C.