IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Cadmium formate with Water

Components:
   (1) Cadmium formate; Cd(CHO2)2; [4464-23-7]  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 = 0 ºC to 100 ºC

Prepared By:
   Chr. Balarew and St. Trendafilova

Experimental Remarks:

   The molality values were calculated by the compilers.

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

Solubility of cadmium formate in water
t/°C	g₁/g₂	Phase	Mass Fraction w₁	m₁ [mol kg-1]	Solid Phase(s)^a
0	8.4	Liquid	7.8	0.42	A
10	11.1	Liquid	9.99	0.548	A
20	14.4	Liquid	12.6	0.711	A
30	18.6	Liquid	15.7	0.919	A
40	25.4	Liquid	20.3	1.26	A
50	38.5	Liquid	27.8	1.90	A
60	59.5	Liquid	37.3	2.94	A
66	75.5	Liquid	43.0	3.73	A
70	77.0	Liquid	43.5	3.80	B
80	80.5	Liquid	44.6	3.98	B
90	85.2	Liquid	46.0	4.21	B
100	94.6	Liquid	48.6	4.67	B

Notes:
   ^a  The solid phases are: A = Cd(CHO₂)₂•2H₂O; B = Cd(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 in an oven at 125 °C, cooled in a desiccator and reweighed. From the weight of anhydrous salt the solubility in g/100g H₂O was calculated.

Source and Purity of Materials:
   An aqueous solution of commercial cadmium formate was heated on a steam bath. A precipitate, which contained iron, was filtered off, and the salt was recrystallized twice from a weak formic acid solution. It was dried at 105 °C and stored in a desiccator. The dihydrate was then prepared by recrystallization at room temperature from a 1% formic acid solution. The anhydrous salt was obtained by another recrystallization at 70-75 °C.

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