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Oxidation of chromium(III) by alkaline hexacyanoferrate(III)

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Summary

Alkaline hexacyanoferrate(III) oxidation of freshly prepared solutions of CrIII (pH>12) at 27°C follows the rate law, Equation 1:

$$Rate = \frac{{kK_{OH} [Fe(CN)_6 ]^{3 - } [Cr^{III} ]_T [OH^ - ]_T }}{{(1 + K_{OH} [OH^ - ]_T )}}$$
(1)

[Fe(CN)6]3− and [Cr(OH)4]− are the active species. The values of KOH(1.62±0.02 dm3 mol−1) and k (2.5±0.2 dm3 mol−1s−1), the formation constant of [Cr(OH)4]− from soluble Cr(OH)3 and the rate constant respectively, were determined at 27.0°C. The solubility of CrIII at pH>12 decreases with time, presumably due to slow formation of polynuclear CrIII species.

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Authors and Affiliations

  1. Department of Chemistry, Karnatak University, 580003, Dharwad, India

    Suresh M. Tuwar, Sharanappa T. Nandibewoor & Javali R. Raju

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  1. Suresh M. Tuwar
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  2. Sharanappa T. Nandibewoor
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  3. Javali R. Raju
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Tuwar, S.M., Nandibewoor, S.T. & Raju, J.R. Oxidation of chromium(III) by alkaline hexacyanoferrate(III). Transition Met Chem 16, 335–338 (1991). https://doi.org/10.1007/BF01024077

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