Study of bromide salts solubility in the (m1KBr + m2CaBr2)(aq) system at T = 323.15 K. Thermodynamic model of solution behaviour and (solid + liquid) equilibria in the ternaries (m1KBr + m2CaBr2)(aq), and (m1MgBr2 + m2CaBr2)(aq), and in the qui

► We study the solubility in the mixed system (m1KBr + m2CaBr2)(aq) at T = 323.15 K. ► We construct T-variable model for (m1KBr + m2CaBr2)(aq) and (m1MgBr2 + m2CaBr2)(aq). ► The solubility modelling approach based on Pitzer equations is employed. ► We validate the model for all subsystems within quinary {Na + K + Mg + Ca + Br + H2O} system. ► Model calculations are in excellent agreement with the reference data and recommendations.