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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Calcium formate with Formic acid
Components:
(1) Calcium formate; Ca(CHO2)2; [544-17-2]
NIST Chemistry WebBook
for detail
(2) Formic acid; CH2O2; [64-18-6]
NIST Chemistry WebBook
for detail
Original Measurements:
Kendall, J.; Adler, H., J. Am. Chem. Soc. 43, 1470 (1921).
Variables:
Temperature = 6.6 ºC to128.6 ºC
Prepared By:
T. A. Ageyeva
Experimental Data:
(Notes on the Nomenclature)
The solubility of calcium formate in formic acid.
t/°C
10
0
* Mole Fraction
1
Solid Phase(s)
8.4
0.0
CH2O2
8.1
0.16
CH2O2
7.7
0.48
CH2O2
7.4
0.71
CH2O2
7.2
0.93
CH2O2
6.9
1.27
CH2O2
6.6
1.53
CH2O2
128.6
0.39
Ca(CHO2)2
100.0
0.57
Ca(CHO2)2
79.0
0.83
Ca(CHO2)2
61.0
1.10
Ca(CHO2)2
49.7
1.26
Ca(CHO2)2
45.5
1.35
Ca(CHO2)2
35.0
1.54
Ca(CHO2)2
30.0
1.61
Ca(CHO2)2
Method/Apparatus/Procedure:
The only information given is that the solubility values were measured by the freezing point method.
Source and Purity of Materials:
The calcium salt was prepared by dissolving a pure sample of the carbonate in 90% formic acid. The salt obtained was recrystallized several times from water and dried to constant weight at 413 K; purity is not specified. The formic acid was prepared by treating a c.p. product with B
2
O
3
. It was then distilled
in vacuo
until a product melting above 281.6 K was obtained.
Estimated Errors:
Solubility: Nothing is specified.
Temperature: Nothing is specified.