The Rate Constant of the Reaction between Hydrogen Peroxide and Ferrous Ions

摘要

The rate constant of the reaction between hydrogen peroxide and ferrous ions has been measured in sulfuric acid solutions, by direct spectrophotometric observations of the ferric salt produced at lgr;=304 mmgr;. It has been confirmed that the rate is independent of acidity (measurements were carried out from 0.05 N to 0.8 N H2SO4) and that the reaction is bimolecular within a wide range of the concentrations of the reactants; the hydrogen peroxide concentration was varied in the ratio 1:25 and the ferrous sulfate in the ratio 1:20. The rate constant, which has been measured within the temperature range of 15deg; to 40deg;C, can be represented by the equationk1equals;1.05times;108times;explpar;minus;8460sol;RTrpar;1thinsp;molesminus;1secminus;1.