IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Barium formate with Cadmium formate and Water

Components:
   (1) Barium formate; Ba(CHO2)2; [541-43-5]  NIST Chemistry WebBook for detail
   (2) Cadmium formate; Cd(CHO2)2; [4464-23-7]  NIST Chemistry WebBook for detail
   (3) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Nadzharyan, K.A.; Itkina, L.S.; Lepeshkov, I.N., Zh. Neorg. Khim. 25, 1676-9 (1980).

Variables:

   Concentration = Composition at 50 ºC

Prepared By:
   Chr. Balarew and St. Trendafilova

Experimental Data:   (Notes on the Nomenclature)
(Please see footnotes following the table(s).)

Solubility values in the Ba(CHO₂)₂-Cd(CHO₂)₂-H₂O system at 50 °C.
Chemical₁	Phase	Mass Fraction w₁	m₁ [mol kg-1]^a	Chemical₂	Mass Fraction w₂	m₂ [mol kg-1]^a	Solid Phase(s)^b
Cd(CHO2)2	Liquid	27.77	1.899	Ba(CHO2)2	---	---	A
Cd(CHO2)2	Liquid	25.34	1.765	Ba(CHO2)2	3.73	0.231	A
Cd(CHO2)2	Liquid	25.11	1.793	Ba(CHO2)2	5.70	0.362	A+B
Cd(CHO2)2	Liquid	23.82	1.665	Ba(CHO2)2	5.53	0.344	B
Cd(CHO2)2	Liquid	17.54	1.145	Ba(CHO2)2	6.82	0.396	B
Cd(CHO2)2	Liquid	12.96	0.814	Ba(CHO2)2	8.36	0.467	B
Cd(CHO2)2	Liquid	8.30	0.515	Ba(CHO2)2	12.10	0.668	B
Cd(CHO2)2	Liquid	2.65	0.169	Ba(CHO2)2	19.83	1.125	B
Cd(CHO2)2	Liquid	1.54	0.106	Ba(CHO2)2	26.88	1.651	B
Cd(CHO2)2	Liquid	1.27	0.087	Ba(CHO2)2	27.00	1.655	B+C
Cd(CHO2)2	Liquid	---	---	Ba(CHO2)2	26.83	1.612	C

Notes:
   ^a  The molality values were calculated by the compilers.
   ^b  The solid phases are: A = Cd(CHO₂)₂•2H₂O; B = CdBa(CHO₂)₄•2H₂O; C = Ba(CHO₂)₂.

Method/Apparatus/Procedure:
   The isothermal method was used. The mixtures were placed in glass vessels in a thermostat and stirred mechanically. Equilibrium was reached in 1.5 weeks. The barium content of both phases was determined gravimetrically as BaSO₄ in the presence of Complexon III.¹ The cadmium content was determined complexometrically. The composition of the solid phases was determined by Schreinemakers' method, IR spectroscopy, TG analysis and x-ray diffraction.

Source and Purity of Materials:
   The barium formate was p.a. grade. The cadmium formate was prepared by the reaction of 85% formic acid with p.a. grade CdCO₃. Both formates were recrystallized twice from a 1% formic acid solution.

Estimated Errors:

   Temperature: Not given.

References:
   ¹R. Pribil and D. Maricova, Chem. Listy 46, 542 (1952).