ABSTRACT

Osmotic coefficients of aqueous solutions of Bu4NBr, sec-Bu4NBr, iso-Bu4NBr, Bu2Et2NBr, and Bu3EtNBr are measured at T = (283.15 and 288.15) K by the isopiestic method. A branched isopiestic apparatus was used. The osmotic data of the solutions were compared at T = (283.15 and 298.15) K. Osmotic coefficient data are correlated using the Pitzer model. The parameters obtained with the Pitzer model are used to calculate the mean molal activity coefficients. Vapor pressures of the solutions are evaluated from osmotic coefficients, and their depression was used for qualitative deduction of solute-solvent interactions occurring in these solutions.

Compounds

#	Formula	Name
1	C16H36BrN	tetrabutylammonium bromide
2	C16H36BrN	tetra-sec-butyl ammonium bromide
3	C16H36BrN	tetra-iso-butyl ammonium bromide
4	C12H28BrN	dibutyldiethylammonium bromdie
5	C10H24BrN	butyltriethyl ammonium bromide
6	H2O	water

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Phase	Method	#Points
POMD	1 6	Osmotic coefficient ; Liquid	Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Liquid Gas	ISOPIE	21
POMD	6 2	Osmotic coefficient ; Liquid	Temperature, K; Liquid Molality, mol/kg - 2; Liquid	Liquid Gas	ISOPIE	21
POMD	6 3	Osmotic coefficient ; Liquid	Temperature, K; Liquid Molality, mol/kg - 3; Liquid	Liquid Gas	ISOPIE	21
POMD	6 4	Osmotic coefficient ; Liquid	Temperature, K; Liquid Molality, mol/kg - 4; Liquid	Liquid Gas	ISOPIE	21
POMD	6 5	Osmotic coefficient ; Liquid	Temperature, K; Liquid Molality, mol/kg - 5; Liquid	Liquid Gas	ISOPIE	21

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Isopiestic Determination of the Osmotic and Activity Coefficients of Aqueous Solutions of Symmetrical and Unsymmetrical Quaternary Ammonium Bromides at T = (283.15 and 288.15) K

Amado, E.[Eliseo], Blanco, L. H.[Luis H.]

ABSTRACT