IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Calcium formate with Calcium chloride and Water

Components:
   (1) Calcium chloride; CaCl2; [10043-52-4]  NIST Chemistry WebBook for detail
   (2) Calcium formate; Ca(CHO2)2; [544-17-2]  NIST Chemistry WebBook for detail
   (3) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Stoilova, D., Bulg. Chem. Commun. 25, 249-57 (1992).

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 Ca(CHO₂)₂-CaCl₂-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
Ca(CHO2)2	Liquid	14.62	1.316	CaCl2	----	----	A
Ca(CHO2)2	Liquid	11.51	1.051	CaCl2	4.31	0.461	A
Ca(CHO2)2	Liquid	8.94	0.855	CaCl2	10.68	1.197	A
Ca(CHO2)2	Liquid	6.99	0.697	CaCl2	15.90	1.858	A
Ca(CHO2)2	Liquid	4.65	0.489	CaCl2	22.27	2.746	A
Ca(CHO2)2	Liquid	4.03	0.452	CaCl2	27.42	3.604	A
Ca(CHO2)2	Liquid	3.74	0.466	CaCl2	34.55	5.044	A
Ca(CHO2)2	Liquid	4.45	0.597	CaCl2	38.23	6.009	eutonic
Ca(CHO2)2	Liquid	2.75	0.378	CaCl2	41.35	6.665	B
Ca(CHO2)2	Liquid	----	----	CaCl2	45.30	7.462	B

Notes:
   ^a  The molality values were calculated by the compilers.
   ^b  The solid phases are: A = Ca(CHO₂)₂; B = CaCl₂•6H₂O.

Method/Apparatus/Procedure:
   The method used was the isothermal decrease of supersaturation. Equilibrium was reached in 10-15 h. The calcium content was determined complexometrically. The chloride ion content was determined volumetrically by the Mohr method. The calcium formate concentration was estimated by difference. The composition of the ideally suction-dried solid phase was determined by the Schreinemakers method. X-ray diffraction and DT analysis were also used.

Source and Purity of Materials:
   The calcium chloride was p.a. grade (Merck). The calcium formate was prepared by the reaction of dilute formic acid with calcium oxide, carbonate or hydroxide, all of which were p.a. grade (Merck or Fluka).

Estimated Errors:
   Solubility: No information is given.
   Temperature: No information is given.