Graphic Illustration of Chemical Equilibria between Nitrogen Oxides and Aqueous Solutions

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Equilibria between the nitrogen oxides and dilute aqueous solution are closely related with atmospheric chemistry and uptake process of these substances by living body. Chemical thermodynamics of the reactions of nitrogen oxides and aqueous solutions are studied in this report. The results are graphically illustrated to give the equilibrium concentrations of each species at 25°C. The reactions examined are as follows. H++NO2-=HNO2, 2NO2+H2O= NO2-+ NO3-+ 2H+ or 2NO2+ H2O= HNO2+ NO3-+ H+, NO+NO2+H2O= 2NO2-+2H+ or NO+ NO2+ H2O= 2HNO2, 3NO2+ H2O= 2NO3-+ NO+2H+, 3NO2-+ 2H+= NO3-+ 2NO+ H2O or 3HNO2= NO3-+ 2NO+ H++ H2O, NO2+ NO2-= NO3-+NO or NO2+ HNO2= NO3-+ H++ NO, 2NO+O2= 2NO2, 2NO2-+O2= 2NO3- or 2HNO2+O2=2NO3-+2H+, 4NO+O2+2H2O=4NO2-+4H+ or 4NO+O2+ 2H2O= 4HNO2, 4NO+ 302+ 2H2O= 4NO3-+ 4H+, 4NO2+ O2+ 2H2O= 4NO3-+4H+, 4NO2-+ 4H++ O2=4NO2+ 2H2O or 4HNO2+ O2= 4NO2+ 2H2O.Relative stability of NO2- and NO3- in aqueous solution are also discussed. NO3- is more stable than NO2-in solution where O2 is not involved if the ratio of gaseous concentrations of NO/NO2 is lower than ca. 106. NO3-predominates over. NO2- in aqueous solution in equilibrium with O2 at 0.2 atm.
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