Temperature Dependent Thermodynamic Model of the System H+−NH4+−Na+−SO42−−NO3−−Cl−−H2O

A thermodynamic model of the system H+−NH4+−Na+−SO42−−NO3−−Cl−−H2O is parametrized and used to represent activity coefficients, equilibrium partial pressures of H2O, HNO3, HCl, H2SO4, and NH3, and saturation with respect to 26 solid phases (NaCl(s), NaCl·2H2O(s), Na2SO4(s), Na2SO4·10H2O(s), NaNO3·Na2SO4·H2O(s), Na3H(SO4)2(s), NaHSO4(s), NaHSO4·H2O(s), NaNH4SO4·2H2O(s), NaNO3(s), NH4Cl(s), NH4NO3(s), (NH4)2SO4(s), (NH4)3H(SO4)2(s), NH4HSO4(s), (NH4)2SO4·2NH4NO3(s), (NH4)2SO4·3NH4NO3(s), H2SO4·H2O(s), H2SO4·2H2O(s), H2SO4·3H2O(s), H2SO4·4H2O(s), H2SO4·6.5H2O(s), HNO3·H2O(s), HNO3·2H2O(s), HNO3·3H2O(s), and HCl·3H2O(s)). The enthalpy of formation of the complex salts NaNH4SO4·2H2O(s) and Na2SO4·NaNO3·H2O(s) is calculated. The model is valid for temperatures ≲263.15 up to 330 K and concentrations from infinite dilution to saturation with respect to the solid phases. For H2SO4−H2O solutions the degree of dissociation of the HSO4− ion is represented near the experimental uncertainty over wide temperature and co...