Kinetics of the reduction of rosaniline hydrochloride with sulphite ion in aqueous perchloric acid

  • OA Babatunde Department of Chemistry, Nigerian Defence Academy, Kaduna, Nigeria
  • JF Iyun Department of Chemistry, Ahmadu Bello University, Zaria, Nigeria
  • OA Peters Department of Chemistry, Ahmadu Bello University, Zaria, Nigeria
Keywords: Rosaniline hydrochloride, sulphite, kinetics and mechanism

Abstract

The kinetics of the reduction of rosaniline hydrochloride (RH) in perchloric acid has been investigated under pseudo-first order condition of an excess [SO32-] at ionic strength of 1.0 mol dm-3 (CH3COONa), T = 30 0.1 o C and λmax = 540nm. The stoichiometry of the reaction was observed to be 1:1in terms of mole ratio of RH and SO32- ions consumed. The rate of reaction increased with increase in ionic strength.

The rate law is found to be of the form.

- (d/dt)[RH] = ( a + b [H+]-1 ) [RH]

where a =0.30 x 10-2 mol dm-3 min-1 and b= 70.58 x 10-2 mol dm-3 min-1 and a pH range of 1.0 [H+] 3.5 x 10-4 mol dm-3. The results from kinetics studies and spectroscopy investigations did not implicate complex formation. A plausible mechanism is proposed for the reaction.

KEY WORDS:- Rosaniline hydrochloride, sulphite, kinetics and mechanism.

Global Journal of Pure and Applied Sciences Vol.10(4) 2004: 555-561
Published
2004-11-10
Section
Articles

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eISSN: 1118-0579