IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Calcium formate with Water

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

Original Measurements:
   Ashton, F.W.; Houston, D.F.; Saylor, C.P., J. Res. Nat. Bur. Stand. 11, 233-53 (1933).

Variables:
   Temperature = 20 ºC and 42 ºC

Prepared By:
   Chr.Balarew and St. Trendafilova

Experimental Remarks:

   Note: Most of the data are given only in graphical form. A table of evaluated data^1-3 is also given.

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

Solubility of calcium formate in water.
t/°C	g₁/g₂	Phase	Mass Fraction w₁	m₁ [mol kg-1]^a	Solid Phase(s)^b
20	16.7	Liquid	14.3	1.28	A
42	17.2	Liquid	14.6	1.32	A

Notes:
   ^a  These values were calculated by the compilers.
   ^b  The solid phase is: A = Ca(CHO₂)₂.

Method/Apparatus/Procedure:
   The isothermal method was used. Samples were taken at 6 and 18 h, filtered into weighing bottles and weighed. They were then evaporated to dryness in an oven at 125 °C, cooled in a desiccator and weighed. From the weight of anhydrous salt thus obtained, the solubility in g/100g H₂O was calculated. The calcium content was determined by dissolving a sample in sulfuric acid, concentrating it by evaporation, and the acid driven off. The residue was then ignited, cooled, and weighed as sulfate.

Source and Purity of Materials:
   Commercial calcium formate was used. It was recrystallized twice, dried at 125 °C and stored in a desiccator.

Estimated Errors:
   Solubility: ± 0.1 g/100 g H₂O.

References:
   ¹E. R. v. Krasnicki, Monatsh. Chem. 81, 355 (1887).
   ²J. C. Lumsden, J. Chem. Soc. London 81, 355 (1902).
   ³H. Stanley, Chem. News 89, 193 (1904).