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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:
Nadzhafyan, K.A.; Kaganskii, I.M.; Stamikosto, E.V.; Erayser, L.N.; Skulskaya, E.I., Zh. Neorg. Khim. 34, 2152 (1989).
Variables:
Temperature = 20.05 ºC to 50.05 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 Cd(CHO
2
)
2
- H
2
O system.
t/°C
Phase
Mass Fraction w
1
m
1
[mol kg-1]
a
Solid Phase(s)
b
t = 20.05 °C
Liquid phase Cd(CHO2)2
12.0
0.674
A
t = 25.05 °C (c)
Liquid phase Cd(CHO2)2
14.10
0.809
A
t = 30.05 °C
Liquid phase Cd(CHO2)2
15.0
0.872
A
t = 40.05 °C
Liquid phase Cd(CHO2)2
19.3
1.181
A
t = 50.05 °C
Liquid phase Cd(CHO2)2
26.2
1.754
A
t = 50.05 °C
Liquid phase Cd(CHO2)2
27.77
1.899
A
Notes:
a
These values were calculated by the compilers.
b
The solid phase is: A = Cd(CHO
2
)
2
•2H
2
O.
c
These values were determined using the isothermal method. The other values were obtained using the polythermal method.
Method/Apparatus/Procedure:
The isothermal and polythermal method were used.
1
Equilibrium was achieved in 1.5-2 weeks. The cadmium content was determined by complexometric titration using Eriochrome Black T as indicator. The solid phase was identified using Schreinemakers', spectroscopic , thermal and x-ray methods.
Source and Purity of Materials:
Cd(CHO
2
)
2
•2H
2
O was prepared from c.p. grade cadmium carbonate and 85% formic acid. The product was recrystallised twice from 1% formic acid. Purity is not specified. The water is freshly distilled.
Estimated Errors:
Temperature: The temperature was controlled to within ±1 °C
1
References:
1
K. A. Nadzharyan, L. S. Itkina, and I. N. Lepeshkov, Zh. Neorg. Khim.
25
, 1676 (1980).