The solubilities of (m(1) NaCl + m(2)Na(2)CrO(4))(aq) and (m(1) KCl + m(2)K(2)CrO(4))(aq) where in denotes molality have been investigated at the temperature T = 298.15 K by the physico-chemical analysis method. Only the crystallization of the simple salts NaCl, Na2CrO4.4H(2)O, KCl, and K2CrO4 have been established, The ternary solutions have been simulated thermodynamically at T = 298.15 K using the Pitzer model. The necessary thermodynamic parameters (binary and ternary ion-interaction parameters, thermodynamic solubility products) have been calculated and the theoretical solubility isotherms plotted. A very good agreement is found between calculated and experimental solubility isotherms. The standard molar Gibbs energies of formation Delta(r)G(m)(o) of solid phases crystallizing in the systems under consideration have been estimated from theory.