PHREEQC and Reaktoro were also tested against CO2 solubility measurements in both water and NaCl solutions up to 400 bar and 150⁰C . Figure shows the performance of the models against the solubility measured in water (panel a), 1 m NaCl (panel b), and 4 m NaCl (panel c). In pure water, both the pitzer and the phreeqc databases yield the same results. Yet, as the ionic strength increases, only the pitzer database, which includes interaction parameters between the CO2 and the Na + satisfactorily predicts the solubility of CO2.