Thermodynamic properties of the mixed electrolyte systems {yMgCl2 + (1 - y)NaCl}(aq) and {yMgCl2 + (1 - y)CaCl2)(aq) at 298.15 K

摘要: Abstract Aqueous mixtures of electrolytes magnesium with sodium or calcium {yMgCl2+(1−y)NaCl}(aq) and {yMgCl2+(1−y)CaCl2}(aq) have been studied using the hygrometric method at 298.15 K. The water activities each system are measured total molalities from 0.2 mol kg−1 to saturation for different ionic strength fractions ( y ) MgCl2 = 0.33 , 0.50 0.67. results allow deduction osmotic coefficients. Experimental compared calculations Zdanovskii–Stokes–Robinson (ZSR), Kusik Meissner (KM), Robinson Stokes (RS), Lietzke Stoughton (LS II), Reilly–Wood–Robinson (RWR) rules, Pitzer model. show that a good accuracy is obtained As matter fact, in model parameters θ ψ adjusted. From these measurements, mixing determined used predict solute activity coefficients their mixtures. excess Gibbs energies also determined.