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 25 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 25 °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	14.10	0.811	Ba(CHO2)2	---	---	A
Cd(CHO2)2	Liquid	12.91	0.748	Ba(CHO2)2	1.89	0.098	A
Cd(CHO2)2	Liquid	12.46	0.738	Ba(CHO2)2	4.17	0.220	A+B
Cd(CHO2)2	Liquid	11.11	0.646	Ba(CHO2)2	3.97	0.206	B
Cd(CHO2)2	Liquid	9.34	0.534	Ba(CHO2)2	4.33	0.221	B
Cd(CHO2)2	Liquid	6.33	0.354	Ba(CHO2)2	5.32	0.265	B
Cd(CHO2)2	Liquid	3.86	0.217	Ba(CHO2)2	8.16	0.408	B
Cd(CHO2)2	Liquid	1.58	0.093	Ba(CHO2)2	14.84	0.781	B
Cd(CHO2)2	Liquid	1.51	0.091	Ba(CHO2)2	16.92	0.912	B
Cd(CHO2)2	Liquid	1.22	0.078	Ba(CHO2)2	21.16	1.199	B
Cd(CHO2)2	Liquid	1.02	0.066	Ba(CHO2)2	22.44	1.289	B+C
Cd(CHO2)2	Liquid	---	---	Ba(CHO2)2	23.71	1.367	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 2 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).