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Kinetics and Mechanism of the Chlorate-Nitrous Acid Reaction
Rafaela T P Sant'Anna1, Roberto B Faria1
1Instituto de Química, Universidade Federal do Rio de Janeiro , Av. Athos da Silveira Ramos 149, CT, Bloco A, 21941-909 Rio de Janeiro, Brazil.
Inorganic Chemistry
|September 6, 2017
Summary
The chlorate-nitrous acid reaction
Area of Science:
- Chemical kinetics
- Aqueous chemistry
Background:
- The reaction between chlorate and nitrous acid is complex.
- Understanding nitrogen and chlorine aqueous chemistry is crucial.
Purpose of the Study:
- Investigate the chlorate-nitrous acid reaction in acid media.
- Elucidate reaction kinetics and product formation under varying concentrations.
Main Methods:
- Ultraviolet-visible (UV-vis) spectroscopy was employed.
- Reactions were studied in both high and low reagent concentrations.
Main Results:
- High concentrations showed first-order kinetics for H+ and nitrous acid (HNO2), and 0.79 order for chlorate, forming chlorine dioxide (ClO2).
- Chlorine dioxide formation was observed only after complete nitrous acid consumption.
- Lowering reagent concentrations resulted in 0.91 order for nitrous acid and no chlorine dioxide formation.
- An isosbestic point at 312 nm indicated a 1:1 ratio between nitrate and nitrous acid species.
Conclusions:
- A comprehensive model with 14 species and 12 reactions was developed.
- The model successfully simulates experimental data for both high and low concentrations.
- This study significantly advances the understanding of complex nitrogen and chlorine aqueous chemistry.
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