Subscribe

Subscribe to our Newsletter and get informed about new publication regulary and special discounts for subscribers!

IFSL > Volume 3 > Kinetics of the Oxidation of Bromopyrogallol Red...
< Back to Volume

Kinetics of the Oxidation of Bromopyrogallol Red by Nitrite Ion in Aqueous Acidic Medium

Full Text PDF

Abstract:

The kinetics of the electron transfer reaction between Bromopyrogallol (BPR2-) and nitrite ion in aqueous acidic solution has been studied in the acid range 0.1 × 10-4 ≤ [H+] ≤ 2 × 10-4 mol dm-3, ionic strength 0.01 ≤ ≤ 0.18 mol dm-3 (NaCl) and T = 29 ± 1.°C. The reaction shows a first order dependence on oxidant and reductant concentration respectively. The rate of the reaction increases with increase in [H+]. Plot of k2 versus [H+] was linear with a positive intercept. The overall reaction conforms to the rate law: -d[BPR2-]/dt = (a + b[H+])[BPR2][NO2-]. The stoichiometry of the reaction is 1:1 (BPR2- : NO2-). Added anions had no effect on the rate of the reaction. The results of spectroscopic investigation indicate that no intermediate complex is probably formed in the course of this reaction. The reaction is believed to proceed via the outersphere mechanistic pathway.

Info:

Periodical:
International Frontier Science Letters (Volume 3)
Pages:
32-38
DOI:
https://doi.org/10.18052/www.scipress.com/IFSL.3.32
Citation:
S. O. Idris et al., "Kinetics of the Oxidation of Bromopyrogallol Red by Nitrite Ion in Aqueous Acidic Medium", International Frontier Science Letters, Vol. 3, pp. 32-38, 2015
Online since:
Jan 2015
Authors:
Sulaiman Ola Idris, V.O. Samson, B. Myek
Keywords:
Bromopyrogallol Red, Kinetics, Mechanism, Nitrite
Export:
RIS, BibTeX, Text
Distribution:
Open Access

Creative Commons License
This work is licensed under a
Creative Commons Attribution 4.0 International License

References:

A. Adetoro, J. F. Iyun and S. O. Idris. Kinetic Approach to the Mechanism of Redox Reaction of Pyrocatechol Violet and Nitrite Ion in Aqueous Hydrochloric Acid. Research Journal of Applied Sciences. Engineering and Technology 3(10): 1159-1163, 2011 and the references therein.

Keihei, U., Toshiaki, I. and Chang, K. L. Handbook of organic and analytical reagents, 2nd ed. Boca Raton, CRC Press, (1992).

Mohammed, Y., Iyun, J. F. and Idris, S. O. Kinetic approach to the mechanism of the redox reaction of malachite green and permanganate ion in aqueous acidic medium. Afr. J. Pure Appl. Chem., 2009, 3: 12, 269.

Onu, A.D. and J.F. Iyun, 1998. Kinetics and mechanism for oxidation of rosaniline monochloride by nitrite ions. J. Chem. Res., 3: 25-26.

Onu, A.D., Iyun, J. F. and Idris, S.O. The kinetics of the reduction of tetraoxoiodate(VII) by n(2-hydroxylethyl)ethylenediaminetriacetatocobaltate (II) ion in aqueous perchloric acid. Trans. Met. Chem., 2009, 34: 849-853.

Babatunde, O. (2009). Kinetics and mechanism of reduction of parafushin by nitrite ions in aqueous medium. World J. Chem., 4(1): 39-44.

Gupta, K.S. and Gupta, Y.K. (1984). Hydrogen ion dependence of reaction rates andmechanism.J. Chem. Edu., 61: 11.

Show More Hide