Xia et al. measured the solubility of H2S in electrolytes (e.g., Na2SO4, NaCl) of different ionic strengths up to 100 bar and 120⁰C. They measured the solubility by adding a known amount of gas to a cell containing a controlled amount of electrolyte. The amount of solution was slowly increased until the gas was completely dissolved in the liquid phase. After equilibration, very small amounts of the liquid mixture were removed to promote degassing. The pressure leading to a small gas bubble was recorded as the required equilibrium pressure to dissolve the known loaded amount of hydrogen sulfide. Figure shows the performance of the models against the experimental data from Xia et al. . For these experimental conditions, both Reaktoro and PHREEQC satisfactorily predict the solubility of H2S.