Decomposition of aqueous dithionite. Part I. Kinetics of decomposition of aqueous sodium dithionite

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Abstract
A rate equation for the total path of decomposition of aqueous Na2S2O4 in the pH range 3.5–5.0 at 23 °C was determined, taking into account the rapid autocatalytic decomposition as well as the "induction" period. The kinetic data were determined by a continuous polarographic method. The form of the rate equation was found by studying the decomposition of aqueous Na2S2O4 at various values of pH and at various initial concentrations. Rate constants were calculated from the data using the integrated form of the rate equation. The rate equation, with certain limitations, was found to be[Formula: see text]Where k1 = 1.67 × 10−1 l mole−1 s−1 and k2 = 5.83 × 103 l2 mole−2 s−1 at 23 °C; C and C0 being dithionite concentration at time t and initial concentration, respectively. The integrated form of the rate equation was used to generate decomposition curves, which are in reasonable agreement with the experimental data.

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