Hygrometric determination of the water activities and the osmotic and activity coefficients of (ammonium chloride + sodium chloride + water) atT = 298.15 K

摘要: Abstract The mixed aqueous electrolyte system of ammonium and sodium chlorides has been studied by the hygrometric method at temperature 298.15 K. relative humidities this were measured total molalities from 0.3 mol · kg  − 1 to 6 for different ionic-strength fractions NH 4 Cl with y  =  (0.33, 0.50, 0.67). data obtained allow deduction new water activities osmotic coefficients. experimental results are compared predictions extended composed additivity model proposed in our previous work, Robinson–Stokes, Reilly–Wood–Robinson, Lietzke–Stoughton models. From these measurements, Pitzer mixing ionic parameters determined used predict solute activity coefficients mixture.