title: Study of thermodynamic properties of solution of ampicillin sodium in methanol at T = 298.15 k.
abstract: Osmotic coefficients of the solution of Ampicillin sodium in methanol at T = 298.15 K were measured using the isopiestic technique and head space-gas chromatography. The experimental osmotic coefficients have been correlated using the ion interaction model of Pitzer, e-NRTL model of Chen, NRF and a fourth- order polynomial in terms of molality. In this work, reference solution is NaI-CH(3)OH. The vapor pressures of the solutions and the solvent activities have been calculated from the osmotic coefficients. Reliability of the models in expression of the osmotic coefficients were compared on the basis of standard deviation of the fittings. The best fit of experimental osmotic coefficients data have been obtained by the Pitzer based ion interaction model.
authors.forename: Jafar
authors.initials: J
authors.lastname: Azamat
authors.forename: Jaber Jahanbin
authors.initials: JJ
authors.lastname: Sardroodi
mesh_terms: D000667:Ampicillin / Q000737:chemistry*; D002849:Chromatography, Gas; D000432:Methanol / Q000737:chemistry; D008956:Models, Chemical; D013816:Thermodynamics; D055548:Vapor Pressure
chemical_list: D000667:Ampicillin; D000432:Methanol