Isopiestic determination of the activity coefficients of some aqueous rare earth electrolyte solutions at 25/sup 0/C. 3. The rare earth nitrates

Journal Article · Fri Jul 01 00:00:00 EDT 1977 · J. Chem. Eng. Data; (United States)

DOI:https://doi.org/10.1021/je60074a015· OSTI ID:7218754

Rard, J A; Shiers, L E; Heiser, D J; Spedding, F H

The osmotic coefficients of the aqueous trinitrates of Sm, Gd, Tb, and Tm have been measured from 0.1 to 0.2 mol kg/sup -1/ to saturation, and those of erbium and ytterbium trinitrates have been measured from 0.1 mol kg/sup -1/ to well into the supersaturated concentration region. In addition, data for La trinitrate have been measured from 0.32 to 1.26 mol kg/sup -1/. These osmotic coefficients were fitted to semiempirical least-squares equations, and water activities and mean molal activity coefficients were calculated from these equations. The water activities of these rare earth nitrate solutions are much higher than for the corresponding rare earth chlorides and perchlorates at the same molalities, while the nitrate solution mean molal activity coefficients are much lower. Differences between the activities of the various rare earth salts are discussed in terms of ion--water and ion--ion interactions.

• Research Organization: Ames Lab, IA
• OSTI ID: 7218754
• Journal Information: J. Chem. Eng. Data; (United States), Journal Name: J. Chem. Eng. Data; (United States) Vol. 22:3; ISSN JCEAA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CHEMICAL REACTION KINETICS
ELECTROLYTES
ERBIUM COMPOUNDS
ERBIUM NITRATES
GADOLINIUM COMPOUNDS
GADOLINIUM NITRATES
KINETICS
MEDIUM TEMPERATURE
NITRATES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
REACTION KINETICS
SAMARIUM COMPOUNDS
SAMARIUM NITRATES
TERBIUM COMPOUNDS
TERBIUM NITRATES
THULIUM COMPOUNDS
THULIUM NITRATES
YTTERBIUM COMPOUNDS
YTTERBIUM NITRATES