Issue 9, 1987

The hydrolysis of metal ions. Part 10. Kinetic and equilibrium measurements of molybdenum(VI)

Abstract

The potentiometric titration technique has been used to study molybdenum(VI) equilibria in 1.0 mol dm–3 sodium nitrate and at 25 °C. Numerical treatment of the data indicates that the ‘best’ model includes the species [HMoO4], H2MoO4, [Mo7O24]6–, [Mo7O23(OH)]5–, [Mo7O22(OH)2]4–[Mo7O21(OH)3]3–, [Mo8O26]4–, and [Mo10O34]8– whose formation constants, log βpq, are, respectively, 3.92, 8.09, 52.49, 57.57, 61.33, 64.96, 73.18, and 79.15. Evidence is given for the existence of a high-molecular-weight species even though computational limitations preclude its identification. A ‘slow’ region of equilibrium has also been found and its kinetics studied. The reaction mechanism is discussed; the rate constants of the forward and backward reaction, k1 and k–1, are 642 ± 300 dm6 mol–2 s–1 and (2.51 ± 1.00)× 10–5 s–1, respectively. Further evidence for the co-ordination numbers of the protonated forms of the molybdate ion is given.

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1987, 2149-2157

The hydrolysis of metal ions. Part 10. Kinetic and equilibrium measurements of molybdenum(VI)

P. L. Brown, M. E. Shying and R. N. Sylva, J. Chem. Soc., Dalton Trans., 1987, 2149 DOI: 10.1039/DT9870002149

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