Oxidation of ascorbic acid by osmium(VIII)

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Abstract
Reduction of osmium(VIII) by ascorbic acid has been studied in the presence of hydrochloric acid. The reaction is found to be directly proportional to the concentration of ascorbic acid and osmium(VIII) and to the reciprocal of the hydrogen ion concentration. In the proposed mechanism, the reacting species have been shown to be perperosmic acid and ascorbate ion; this was supported by the negligible effect of the ionic strength. Influence of temperature was studied in the range 25–40 °C, and the energy and entropy of activation were calculated as 14.1 ± 0.2 kcal mole−1 and −8.6 ± 0.1 e.u., respectively. Osmium(IV) was found to be a product of the reaction.

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