Kinetics and mechanism of sulfite oxidation by permanganate in basic medium

Ernst, T.; Cyfert, M.; Wilgocki, M.

doi:10.1002/kin.550241008

Cited by 12 publications

(8 citation statements)

References 8 publications

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“…(12)). The formation of the protonated Mn(V) species is consistent with conclusions concerning the permanganate-sulfite [4] and permanganate-cyanide [6] reactions in basic solution. The assumption of concurrent paths (10, 11) of (O 3 MnOH 2 PO 2 )…”

Section: [O Mn -O-p H(o)(oh)] !supporting

confidence: 83%

“…The analysis of absorption spectra obtained in acid solutions shows that the absorption band characteristic for MnO 4 Ϫ ions (450 -650 nm and 275 -350 nm in Fig. 1) disappears during the reaction progress and the absorption in the UV region (200 -250 nm in Fig.…”

Section: Resultsmentioning

confidence: 98%

“…A similar scheme, based on analogous assumptions, was proposed for the sulfite-permanganate reaction [4]. The molecular structure of the postulated intermediate compounds may correspond to e.g.…”

Section: [O Mn -O-p H(o)(oh)] !mentioning

confidence: 94%

“…2 MnO rapid (12) 4 In a weak-acid solution (Fig. 5, range C) When the acidity of the solution increases (Fig.…”

Section: [O Mn -O-p H(o)(oh)] !mentioning

confidence: 97%

“…The entire experimental curves of the concentration of permanganate versus time and analyses of orthophosphate were applied to determine the rate constants and the equilibrium constants of the elementary reactions proposed for various pH ranges. The rate constants of the proposed reactions were estimated using a computer program 'REACTKIN' [4]. The generated profiles were matched, using least-squares fitting, to at least 3 experimental kinetic curves through the entire progress of reaction in which the pH was varied systematically in the analyzed regions.…”

Section: Kinetic Analysismentioning

confidence: 99%

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Mechanism and kinetics of hypophosphite oxidation by permanganate ion

Wojciechowski

Małecki

1999

Int. J. Chem. Kinet.

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The kinetics of the permanganate-hypophosphite redox reaction has been studied over a wide range of pH by using a stopped-flow technique. It has been found that the reaction leads to the formation of phosphite and orthophosphate, and that the molar ratio of the final products depends on pH. The proposed mechanism of the process was based on the assumption that the first step in the oxidation of hypophosphite is a fast reversible reaction in which an intermediate complex (O 3 MnOH 2 PO 2 ) 2Ϫ is formed. The observed dependence of the reaction rate on pH was attributed to the influence of hydrogen and hydroxyl ions on the decomposition of this complex. The rate constants and the equilibrium constants of elementary reactions are given.

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Section: [O Mn -O-p H(o)(oh)] !supporting

confidence: 83%

Section: Resultsmentioning

confidence: 98%

Section: [O Mn -O-p H(o)(oh)] !mentioning

confidence: 94%

“…2 MnO rapid (12) 4 In a weak-acid solution (Fig. 5, range C) When the acidity of the solution increases (Fig.…”

Section: [O Mn -O-p H(o)(oh)] !mentioning

confidence: 97%

Section: Kinetic Analysismentioning

confidence: 99%

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Mechanism and kinetics of hypophosphite oxidation by permanganate ion

Wojciechowski

Małecki

1999

Int. J. Chem. Kinet.

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Studies on toluidine blue reaction with sulfite in aqueous solution and role of Cu(II) as promoter

Jonnalagadda

Gollapalli

1999

Int. J. Chem. Kinet.

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The kinetic and mechanistic details of the reaction between toluidine blue and sulfite were studied spectrophotometrically by monitoring the depletion of toluidine blue at 633 nm. The reaction had first-order dependence on both the reactants, a stoichiometric ratio of 1:1 and a negative salt effect indicating the participation of TB ϩ and SO 3 2Ϫ ions in the ratelimiting step. The reaction products were leuco base of toluidine blue and sulfate. The reaction was pH dependent and hence studied at its optimum pH 7.2. Cu(II) acted as promoter by facilitating the formation of a ternary complex with the reactants. The protonation and stability constants of the reactants were determined and used in validating the mechanism. The activation parameters for the reactions in absence and presence of Cu(II) were determined and compared with other systems.

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