Reaction Kinetics Between HNO₂ and Formaldoxime in Aqueous Perchloric Acid Solution

The reaction kinetics between HNO₂ and formaldoxime in perchloric acid media were studied by spectrophotometric method. The reaction rate equation was determined as follows: -dc(HNO₂)/dt = kc(HNO₂)c^1.32(FO)c^0.96(ClO₄^-), where k ＝(7.55±0.50) (mol/L)^2.28/s at 1.0℃. The reaction activation energy Ea is (65.16±6.52) kJ/mol. Effects of c(FO), c(H⁺), c(ClO₄) and temperature on the reduction rate of HNO₂ were investigated. HNO₂ can be rapidly reduced by FO under usual conditions. The reaction rate increased while increasing concentration of FO, ClO₄^- and reaction temperature. However, the influence of H⁺ is negligible.