Reactions of iodine intermediates in iodate-hydrogen peroxide oscillators
Reaction rates have been measured in acid solution at 25 /sup 0/C for several reactions of iodine species and hydrogen peroxide. The reactions are all subsystems of reactions which occur in iodate-hydrogen peroxide oscillators. Reactions discussed are the following: HOI + HOI ..-->.. HOIO + H/sup +/ + I/sup -/, -1/2d(HOI)dt = 25 +/- 5 M/sup -1/ s/sup -1/(HOI)/sup 2/; HOI + HOIO ..-->.. 2H..mu.. + I/sup -/ + IO/sub 3//sup -/, -d(HOI)/dt = 230 +/- 20 M/sup -1/ s/sup -1/(HOI)(HOIO); HOIO + HOIO ..-->.. H/sup +/ + IO/sub 3//sup -/ + HOI, -1/2d(HOIO)lt. slashdt = 0.3 +/- 0.2 s/sup -1/(HOIO)/sup 2//(H/sup +/); HOI + H/sub 2/O/sub 2/..-->.. H/sup +/ + I/sup -/ + O/sub 2/ + H/sub 2/O, -d(HOI)dt = 5 +/- 3 M/sup -1/ s/sup -1/(HOI)(H/sub 2/O/sub 2/). In addition reaction products have been studied for reaction of H/sub 2/O/sub 2/ with HOI and HOIO. In both cases, at (H/sup +/) approx.0.1 M, oxidation to IO/sub 3//sup -/ is predominant at low (H/sub 2/O/sub 2/). Rates are too fast to establish rate laws by using manual mixing techniques. Calculations for a skeleton model of the Briggs-Rauscher oscillator, using the above rate constants, reproduce basic experimentally observed features.
- Research Organization:
- Pennsylvania State Univ., Reading
- OSTI ID:
- 6631278
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 91:8
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
HYDROGEN PEROXIDE
CHEMICAL REACTIONS
IODATES
IODINE
ABSORPTIVITY
CHEMICAL REACTION KINETICS
EXPERIMENTAL DATA
MEDIUM TEMPERATURE
OSCILLATIONS
PH VALUE
REACTION INTERMEDIATES
DATA
ELEMENTS
HALOGEN COMPOUNDS
HALOGENS
HYDROGEN COMPOUNDS
INFORMATION
IODINE COMPOUNDS
KINETICS
NONMETALS
NUMERICAL DATA
OPTICAL PROPERTIES
OXYGEN COMPOUNDS
PEROXIDES
PHYSICAL PROPERTIES
REACTION KINETICS
400201* - Chemical & Physicochemical Properties