An isopiestic method has been developed to predict aw for ternary solutions from binary aw data. Another method, previously outlined by Robinson and Bower, has been extended to include non‐electrolytes. Both methods have been used to predict aw's for 51 representative systems. The results show that the isopiestic method is as good as, or better than Robinson and Bower's in predicting aw for ternary aqueous electrolyte/ electrolyte, electrolyte/non‐electrolyte and non‐electrolyte/non‐dectrolyte systems. Calculated aw values are in good agreement (<0.5%> error on the average) with experiment. The methods are applicable to relatively concentrated solutions up to 12 m.

The kinetics of the reaction have been studied at 25°C. in strong acid solution; the effects of acidity, chloride, chlorate and chlorine are reported. A mechanism is postulated to interpret the peculiar features of this reaction as well as the stoichiometry and some of the kinetics of the parallel reaction The mechanism involves HClO2 and HOCl as intermediates General rate expressions are derived for the formation of chlorine dioxide and chlorine, and the individual rate constants are calculated. An expression is obtained for the relationship between the ratio of chlorine dioxide to chlorine produced and the ratio of chlorate to chloride.

No abstract