Volumetric estimation of uranium ? Part II with sodium vanadate as reagent

Rao, V. Panduranga; Murty, B. V. Satyanarayana; Rao, G. Gopala

doi:10.1007/bf00443294

Cited by 20 publications

(2 citation statements)

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“…A 0.1 mol dm Ϫ3 solution of iron(II) and 0.5 mol dm Ϫ3 solution of sodium vanadate was prepared and standardized using the literature [11,12] methods. Salicylic acid (0.1 mol dm Ϫ3 ) was prepared and standardized bromometrically [13].…”

Section: Methodsmentioning

confidence: 99%

“…1), showing that k 1 I path is also absent. FeOH ϩ is the preferred reducing species because hydroxylated iron(II), being less positively charged than Fe 2ϩ , is not only a more powerful reductant because of greater nucleophilicity but also the entropy of activation (given approximately by Ϫ10 Z A Z B ) [12] is more positive. These interesting kinetic features observed due to equilibrium between the reactive species VO 2 ϩ and the unreactive decavanadate species are radically different from those observed for this reaction [16] In the present investigation, much lower acidities have been employed and the participation of FeOH ϩ as the active reducing species is more probable.…”

Section: Oxidation In the Absence Of Salicylic Acidmentioning

confidence: 99%

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Kinetics of oxidation of iron(II) by vanadium(V) under the conditions where VO2+ and decavanadate coexist

Babu

Rao

Ramakrishna

et al. 2000

Int. J. Chem. Kinet.

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The kinetics of the reaction between iron(II) and vanadium(V) have been investigated in the pH range 2.6–4.2 where decavanadates and VO2+ coexist in equilibrium. Under these conditions, the observed kinetic pattern is radically different from the one reported for the reaction in strong acid medium. In the pH range employed, the reaction rate is not appreciably altered by variation in the stoichiometric vanadium(V) concentration due to the operation of the equilibrium between the reactive species, VO2+, and the unreactive species, decavanadates. The reaction, however, obeys first‐order kinetics with respect to Fe(II). In the presence of salicylic acid, which imparts considerable reactivity to iron(II) by reducing the reduction potential of iron(III)/iron(II) couple by forming a stronger complex with iron(III) than iron(II), the kinetic results provide evidence for the participation of decavanadates in the electron transfer. The mechanism under both conditions is discussed. © 2000 John Wiley & Sons, Inc. Int J Chem Kinet 32: 535–541, 2000

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Section: Methodsmentioning

confidence: 99%

Section: Oxidation In the Absence Of Salicylic Acidmentioning

confidence: 99%