Reversible Binding of NO to Fe(II)edta

The equilibrium constants, enthalpy, and entropy of the reversible binding of nitrogen oxide to Fe(II)edta in an aqueous solution have been measured in the temperature range 38.5 to 70 °C. Experiments were carried out by absorbing NO under O2 free conditions. The results show that, in the absorption of NO with Fe(II)edta solution, the value of ΔH° is −15.8 kcal/mol and ΔS° is −20.7 e.u.