Hygrometric determination of the water activities and the osmotic and activity coefficients of (ammonium chloride + sodium chloride + water) atT = 298.15 K |
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| Institution: | 1. Centre de Recherche du Centre Hospitalier de l''Université de Montréal (CRCHUM), Montreal, Quebec, Canada;2. Faculté de Pharmacie, Université de Montréal, Montreal, Quebec, Canada;3. Département de Pharmacologie et de Physiologie, Faculté de Médicine, Université de Montréal, Montreal, Quebec, Canada;4. Unité des Troubles du Mouvement André Barbeau, Centre Hospitalier de l''Université de Montréal, Montreal, Quebec, Canada;5. Division of Neurology, Centre Hospitalier de l''Université de Montréal, Montreal, Quebec, Canada;6. Comparative Medicine and Animal Resources Centre, McGill University, Montreal, Quebec, Canada;7. Pharmacotherapy and Translational Research, College of Pharmacy, University of Florida, Lake Nona Campus, Orlando, FL, USA;8. Groupe de Recherche en Pharmacologie Animal du Québec, Département de Biomédecine Vétérinaire, Faculté de Médecine Vétérinaire Université de Montréal, Saint-Hyacinthe, Quebec, Canada |
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| Abstract: | The mixed aqueous electrolyte system of ammonium and sodium chlorides has been studied by the hygrometric method at the temperature 298.15 K. The relative humidities of this system were measured at total molalities from 0.3mol · kg − 1 to 6 mol · kg − 1for different ionic-strength fractions of NH 4Cl with y = (0.33, 0.50, and 0.67). The data obtained allow the deduction of new water activities and osmotic coefficients. The experimental results are compared with the predictions of the extended composed additivity model proposed in our previous work, the Robinson–Stokes, Reilly–Wood–Robinson, and Lietzke–Stoughton models. From these measurements, the new Pitzer mixing ionic parameters were determined and used to predict the solute activity coefficients in the mixture. |
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