Osmotic and activity coefficient of L –Serine in aqueous solutions of ionic liquid[cmmim][Cl] at T=۲۹۸.۱۵K

Amino acids are the building blocks of other biomolecules such as peptides and proteins; therefore for their separation process it is important to study their behavior in aqueous systems containing electrolytes [۱]. One of the thermodynamic properties of aqueous amino acid solutions is water activity which is an important thermodynamic property, because, it is closely related with the other thermodynamic properties such as vapor pressure, osmotic coefficient, activity coefficient, excess enthalpy, excess entropy, excess Gibbs energy and excess volume.The aim of the present essay is to present experimental data on vapour-liquid equilibria using isopiestic method for binary aqueous solutions of L- serine, and the effect of ionic liquid on the activity coefficient of L-serine in aqueous solutions at ۲۹۸.۱۵ K.The results have been used to calculate the activity cofficients of all component in binary and ternary systemes,using original pitzer equations[۲] and modified pitzer for electrolyte+polar non-electrolye mixtures[۳].