The Dissolution of N₂ and of H₂ in Water from Room Temperature to 640 K

Abstract

Abstract The solubilities of H 2 and of N 2 in water have been determined over a wide temperature range. The thermodynamic analysis of the data allowed the calculation of Henry's constants ( k ∞ H ) as function of temperature from room temperature to 636 K; other thermodynamic quantities of dissolution have been derived from the temperature dependence of k ∞ H . With a semiempirical perturbation method it is possible to describe the experimental behaviour and to predict the partial molar volume and heat capacity of the solutes over all the temperature range. This calculation procedure requires the knowledge of the hard‐sphere radii of the solute gases and their (linear) temperature dependence which may be determined from solubility data covering only a reduced temperature range extending to about 400 K.