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Kinetics and mechanism of the oxidation of oxalic acid by tetrachloroaurate(III) ion by Vimal Soni; R.S. Sindal; Raj N. Mehrotra is a Chemistry article available to read on EtoBox.
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The oxidation of oxalic acid by tetrachloroaurate(III) ion in 0.005 6 [HClO 4 ] 6 0.5 mol dm À3 is first order in 1⁄2AuCl 4 À and a fractional order in [oxalic acid], the reactive entities being AuCl 3 (OH) À and HC 2 O 4 À ions. The pseudo first-order rate, k obs , with respect to [Au(III)], is retarded by increasing [H + ] and [Cl À ]. The retardation by H + ion is caused by the dissociation equilibrium A mechanism in which a substitution complex, AuCl 3 C 2 O 4 2À is formed from AuCl 3 (OH) À and HC 2 O 4 À ions prior to its rate limiting disproportionation into products is suggested. The rate limiting constant, k, has been evaluated and its activation parameters are reported. The equilibrium constant K 1 for the formation of the substitution complex AuCl 3 C 2 O 4 2À and its thermodynamic parameters are also reported.
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- Author
- Vimal Soni; R.S. Sindal; Raj N. Mehrotra
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0020-1693)
- Published
- 2007
- Language
- EN
- Field
- Chemistry (Physical Sciences)