Kinetics of Oxidation of Antimony(III) by Tetrachloroaurate(III) in Aqueous Hydrochloric Acid Media
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Rajendra M. Babshet
Abstract
The oxidation of antimony(III) by tetrachloraurate(III) has been studied in aqueous hydrochloric acid medium at 27°C. The reaction follows the rate law
ks = k1K1K2K3K4[Cl]/[H3O+]([H3O+ ] + K1)
(i)
(i) where K1;K2,K3 and K4 are the respective equilibrium constants of the reactions (ii) to (v) and kj is the rate constant of the slow complementary two
HAuCl4 + H2O ⇄ AuCl4- + H3O+ K2 (ii)
AuCl4-+H2O⇄
AuCl3 (OH)- + H3O+ + Cl- K2 (iii)
SbCl4- + Cl- ⇄ SbCl52- K3 (iv)
SbCl52- + Cl- ⇄ SbCl63- K4 (v)
electron transfer step of the reaction between the active species AuCl3(OH)- and SbCl63- of the reactants. The enthalpy and entropy of activation were found to be 19.2 ± 1 kj mol-1 and - 182.5 ± 4 JK-1 mol -1 respectively,suggesting a chorobridged electron transfer.
© 2014 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- Introducing The New Co-Editor Of Inorganic Reaction Mechanisms
- Kinetic and Mechanistic Studies of Substitution Reactions of Solvated Cobalt(II), Nickel(II), Copper(II) and Zinc(II) Ions with 2,2′:6′,2″-Terpyridine and Several 2,2′:6′,2″-Terpyridine Derivatives. Evidence for the Formation of Intermediates
- Activation Volumes for a Series of Spontaneous, Acidand Base-Catalysed Aquation Reactions of Aniono trans- [Co(MeNH2)(NH3)4X]2,1+ Complexes (X=Cl-, Br-,ΝO3-,SO42-)
- Interactions of the Aminoglycoside Neamine and 2-Deoxystreptamine with Copper(II) and Zinc(II)
- Kinetics of Oxidative Deamination and Decarboxylation of L-Asparagine by Alkaline Permanganate: a Mechanistic Approach
- Kinetics of Magnesium Incorporation into Water Soluble Porphyrins
- Micellar Effect on Chromium(VI) Oxidation of D-Glucose in the Presence and Absence of Picolinic Acid in Aqueous Media: A Kinetic Study
- Kinetics of Oxidation of Antimony(III) by Tetrachloroaurate(III) in Aqueous Hydrochloric Acid Media
