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Kinetics and mechanism of oxidation of hydrazinium ion with peroxomonophosphoric acid in acid perchlorate solutions and role of trace iodide ions
Author(s) -
Dhas T. Peter Amala,
Mishra D. K.,
Mittal R. K.,
Gupta Y. K.
Publication year - 1991
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550230303
Subject(s) - chemistry , perchlorate , kinetics , iodide , inorganic chemistry , ion , perchloric acid , trace (psycholinguistics) , organic chemistry , physics , quantum mechanics , linguistics , philosophy
The reaction of peroxomonophosphoric acid and hydrazinium ion in acid perchlorate solutions occurs as per stoichiometry (i), and the rate law (ii) at large [N 2 H 5 + ],where K′ d is the first acid dissociation constant of H 3 PO 5 and k 1 and k 2 are rate constants found to be 2.6 × 10 −4 s −1 and 5.0 × 10 −2 M −1 s −1 , respectively, at 35°. The reaction is greatly catalyzed by iodide ions. The mechanism involves a redox cycle I − /I 2 and the rate is independent of [N 2 H 5 + ] in the presence of iodide ions. K′ d was found to be 0.55 M −1 and independent of temperature.