Kinetics of Haloaminometric Reactions. Mechanism of Oxidation of Thiocyanate Ion by Chloramine-B and Bromamine-B in Acid Medium
| Main Authors: | B. THIMMB GOWDA, J, ISHWARA BHAT |
|---|---|
| Format: | Article Journal |
| Bahasa: | eng |
| Terbitan: |
, 1986
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/6272645 |
Daftar Isi:
- Department of Post-Graduate Studies and Research in Chemistry, Mangalore University, Mangalagangothri-574 199 Manuscript received 28 August 1985, revised 19 March 2986, accepted 7 June 1986 Kinetics of oxidation of thiocyanate ions by chloramine-B (CAB) and bromamine-B (BAB), sources of CI+ and Br+ species, have been studied in presence of perchloric acid at 283 K. The rate of reaction was first order in [NCS-]o with both the oxidants. Pseudo-first order rate constants slightly decreased with the increase in WAR,. The rate was independent of [H41 with CAB, but had slight dependence on [Hi with BAB. Variation of ionic strength of the medium or addition of the reaction products had no effect on the rate with both CAB and BAB. However, the decrease of dielectric constant of the medium decreased the rate with both the oxidants. Thermodynamic parameters have been computed in both the cases. Mechanistic schemes in conformity with the observed kinetics have been proposed and the corresponding rate laws derived. In some cases rate constants for the rate controlling steps have been calculated.