Solubilities of CH3C(O)O2NO2 and HO2NO2 in water and liquid H2SO4

In this paper we analyze literature values of the Henry's law constants of peroxyacetyl nitrate (CH3C(O)O2NO2, PAN) and peroxynitric acid (HO2NO2) in water and liquid sulfuric acid, and derive correlative expressions to predi ct the solubilities of PAN and HO2NO2 in liquid H2SO4 over a wide range of temperature and acidic composition. To a first-order approximation, the res ults indicate that the Henry's law constants (in units of mol kg(-1) atm(-1 )) are ln(H) = 1.07 - mH(2)SO(4) x (0.69 - 152/T) - 5810 x (1/T-0 - 1/T) fo r PAN and ln(H) = 3.69 - mH(2)SO(4) x (- 0.25 + 65/T) - 8400 x (1/T-0 - 1/T ) for HO2NO2 where mH(2)SO(4) is the molality of sulfuric acid, T is the te mperature of solutions, and T-0 = 298.15 K. The activity coefficients of PA N and HO2NO2 in aqueous H2SO4 are found to have a simple relationship with the molality of H2SO4.