Solvation of multivalent cations in methanol – Apparent molar volumes, expansibilities, and isentropic compressibilities

• Published in: The Journal of chemical thermodynamics 2011-11, Vol.43 (11), p.1731-1737
• Main Authors: Wawer, Jarosław, Warmińska, Dorota, Grzybkowski, Wacław
• Format: Article
• Language: English
• Subjects: Adiabatic flow; Chemical thermodynamics; Chemistry; Compressibility; Density; Exact sciences and technology; General and physical chemistry; Mathematical models; Methanol; Methyl alcohol; Mixtures; Molar volume; Solvation; Solvation numbers; Solvation of trivalent cations; Standard partial molar adiabatic compressibilities; Standard partial molar volumes; Thermodynamic properties
• ISSN: 0021-9614; 1096-3626
• DOI: 10.1016/j.jct.2011.05.035

► Investigated M2+ ions: Be2+, Mg2+, Ca2+, Sr2+, Ba2+, Mn2+, Co2+, Ni2+, Cu2+, Zn2+. ► Investigated M3+ ions: Ga3+, Y3+, La3+, Gd3+, and Lu3+. ► Properties of ions are related to charge density of ion and first solvation number. Densities of the solutions of gallium, yttrium, lanthanum, gadolinium, and lutetium trifluoromethanesulfonates in methanol have been determined at temperatures ranging from (283.15 to 313.15)K. The sound velocities in these systems have been measured at T=298.15K. From obtained data the standard partial molar volumes and their temperature derivatives as well as standard partial molar adiabatic compressibilities for ions in solutions have been estimated. The results have been discussed on the basis of the classical model of ion in solution and compared with our earlier findings for divalent cations. The importance of the numbers of solvent molecules in first solvation spheres of ions has been revealed.