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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Sodium formate with Cadmium formate and Water
Components:
(1) Cadmium formate; Cd(CHO2)2; [4464-23-7]
NIST Chemistry WebBook
for detail
(2) Sodium formate; NaCHO2; [141-53-7]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Itkina, L.S.; Nadzharyan, K.A., Zh. Neorg. Khim. 26, 515 (1981).
Variables:
Concentration = Composition at 25 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 values in the NaCHO
2
-Cd(CHO
2
)
2
-H
2
O system at 25 °C.
Chemical
1
Phase
Mass Fraction w
1
m
1
[mol kg-1]
Chemical
2
Mass Fraction w
2
m
2
[mol kg-1]
Solid Phase(s)
a
NaCHO2
Liquid
43.99
11.55
Cd(CHO2)2
---
---
A
NaCHO2
Liquid
46.89
13.29
Cd(CHO2)2
1.15
0.109
A+B
NaCHO2
Liquid
43.16
11.40
Cd(CHO2)2
1.18
0.105
B
NaCHO2
Liquid
38.46
9.375
Cd(CHO2)2
1.23
0.101
B
NaCHO2
Liquid
31.94
7.036
Cd(CHO2)2
1.32
0.098
B
NaCHO2
Liquid
24.41
4.873
Cd(CHO2)2
1.94
0.130
B
NaCHO2
Liquid
16.73
3.134
Cd(CHO2)2
4.78
0.301
B
NaCHO2
Liquid
10.30
1.871
Cd(CHO2)2
8.78
0.536
B
NaCHO2
Liquid
9.11
1.66
Cd(CHO2)2
10.07
0.615
B+C
NaCHO2
Liquid
4.69
0.819
Cd(CHO2)2
11.16
0.655
C
NaCHO2
Liquid
---
---
Cd(CHO2)2
14.10
0.811
C
Notes:
a
The solid phases are: A = NaCHO
2
; B = NaCd(CHO
2
)
3
; C = Cd(CHO
2
)
2
•2H
2
O.
Method/Apparatus/Procedure:
The isothermal method was used. Equilibrium was reached in 3 weeks. The sodium content of both phases was determined by flame photometry. The Cd
2+
content was determined complexometrically using Eriochrome Black T as the indicator. The composition of the solid phases was determined by Schreinemakers' method, by TG analysis, IR spectroscopy and x-ray diffraction.
Source and Purity of Materials:
NaCHO
2
and Cd(CHO
2
)
2
•2H
2
O were prepared by reacting formic acid with p.a. grade NaOH and CdCO
3
, respectively. The sodium formate synthesis was carried out in an alkaline medium to prevent formation of the acid salt.
Estimated Errors:
Temperature: The temperature was kept constant to within ±0.1 °C.