| Abstract: | The generation of chlorine dioxide from the reaction between hypochlorous acid and chlorite with or without an initial chloride addition has been studied under slightly acidic conditions. Chloride (Cl-), one of the products from the reaction, not only changes the reaction stoichiometry, but also alters the rate law. It was found that the formation of chlorine dioxide from the HOCI-ClO2- system consists of two distinct parts, one is promoted by chloride, the other is independent of chloride. The overall kinetics of the chlorine dioxide generation from the reaction is:  This model can very well predict the reaction under the following conditions: $ 273 - 303{rm K},left[ {ClO_2^ - } right] = 0.001 - 0.00267;{rm mol}/{rm L},left[ {ClO_2^ - } right]/left[ {HOCl} right] = 2,;{rm and};{rm pH};3.86 - 4.91 $ |
