The Volumetric Properties of Ternary Solutions of Glycine + H2O + LiBr, NaBr or KBr at T = (293.15–313.15) K and Ambient Pressure

• Published in: Journal of solution chemistry Vol. 48; no. 6; pp. 818 - 834
• Main Authors: Rafiee, Hamid Reza, Amirian, Roshanak
• Format: Journal Article
• Language: English
• Published: New York Springer US 15.06.2019; Springer Nature B.V
• Subjects: Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Constraining; Dilution; Geochemistry; Glycine; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Lithium; Manometers; Mathematical analysis; Oceanography; Physical Chemistry; Potassium bromides; Pressure; Sodium bromides; Volumetric properties; Lithium bromide; Sodium bromide; Glycine; Potassium bromide
• ISSN: 0095-9782; 1572-8927
• DOI: 10.1007/s10953-019-00890-2

In this study, densities of binary and ternary solutions containing (glycine + water), (glycine + water + lithium bromide), (glycine + water + potassium bromide) and (glycine + water + sodium bromide) have been measured using a vibrating U-tube densimeter at T  = (293.15 to 313.15) K. The apparent molar volumes have been calculated from the obtained density data. Apparent molar volumes at infinite dilution, V ϕ 0 , were fitted to a Redlich–Meyer type equation. The limiting apparent molar expansibility, E ϕ 0 , was calculated from the first derivative of the limiting apparent molar volumes with respect to temperature. By analyzing the obtained volumetric data, the hydration numbers for glycine, n H , were also calculated in these solutions. The results indicate that the apparent molar volumes increase with temperature. Moreover, it has been proven that glycine acts as a structure maker in the studied solutions.