The equilibrium between glucose and sulphurous acid

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Abstract
The apparent constants of equilibrium and velocity of the glucose + sulphurous acid reaction were measured under various conditions at 20° c. It was found that: (I) the value of the apparent equilibrium constant is mainly a function of pH; it is lowest between pH, 3 and 5·5 and increases rapidly in more acid or more alkaline regions. Changes in concentration of the reactants (glucose = 1‐40 g./100 ml.; SO2 = 130‐3500 mg./l.) seem to haw only a minor influence; (2) the apparent velocity constants of decomposition and of addition are functions of the pH only.The almost complete parallelism between the dependence of these values upon pH in the case of the bisulphite compounds of both glucose and benzaldehyde suggests the same reaction mechanism.