Models implemented in PHREEQC and Reaktoro are also used to predict the bubble point pressure, Pb, of different geothermal fluids. The phreeqc database was used in all cases since we previously showed that for some gases, the pitzer database did not account for the effect of salinity on the solubility. The predicted values were assessed against experimental evidence found in the literature. Compared to the previous solubility experiments considered, where the chemical composition of the system is relatively simple and carefully designed, the chemistry of the geothermal fluids is an amalgam of different ions and dissolved gases. The degassing point measured for these brines is thus a good way to test the performance of the models against fluid samples representative of natural conditions.