The homogeneous kinetics and catalysis of sodium sulfite oxidation in an aqueous solution were studied by means of the rapid-mixing method of Hartridge and Roughton. This technique allowed the reaction of already dissolved oxygen, thus eliminating possible errors due to the interphase transfer of oxygen. The manner in which the cobalt ion participates in the reaction sequence was developed. A full reaction sequence describing the chain of events was elaborated. A reaction rate expression derived from this sequence was shown to be in agreement with the experimental results. The experimental findings showed that: (a) the reaction rate was independent of oxygen concentration; (b) the reaction order was three-halves with respect to sulfite concentration; and (c) the reaction rate was proportional to the square root of the total concentration of cobalt added to the reacting solution.

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