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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Zinc formate with Cadmium formate and 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
(3) Zinc formate; Zn(CHO2)2; [557-41-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Vasileva, V., Cryst. Res.Technol. 31, 993-1000 (1996).
Variables:
Concentration = Composition at 25 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 Zn(CHO
2
)
2
-Cd(CHO
2
)
2
-H
2
O system at 25 °C.
Chemical
1
Phase
Mass Fraction w
1
m
1
[mol kg-1]
a
Chemical
2
Mass Fraction w
2
m
2
[mol kg-1]
a
Solid Phase(s)
b
Distribution Coefficient
Cd2+/Zn2+
Distribution Coefficient
Zn2+/Cd2+
Zn(CHO2)2
Liquid
5.38
0.365
Cd(CHO2)2
0.00
0.00
A
0.00
0.00
Zn(CHO2)2
Liquid
4.71
0.324
Cd(CHO2)2
1.89
0.099
B
0.48
2.08
Zn(CHO2)2
Liquid
4.50
0.311
Cd(CHO2)2
2.53
0.134
B
0.51
1.96
Zn(CHO2)2
Liquid
4.04
0.280
Cd(CHO2)2
3.35
0.178
B
0.46
2.17
Zn(CHO2)2
Liquid
3.85
0.268
Cd(CHO2)2
3.90
0.208
B
0.49
2.04
Zn(CHO2)2
Liquid
3.64
0.255
Cd(CHO2)2
4.78
0.257
B
0.50
2.00
Zn(CHO2)2
Liquid
3.20
0.227
Cd(CHO2)2
6.29
0.343
B
0.47
2.13
Zn(CHO2)2
Liquid
3.28
0.233
Cd(CHO2)2
6.35
0.347
eutonic
Zn(CHO2)2
Liquid
2.62
0.186
Cd(CHO2)2
7.19
0.393
C
0.63
1.59
Zn(CHO2)2
Liquid
2.21
0.157
Cd(CHO2)2
7.77
0.426
C
0.66
1.52
Zn(CHO2)2
Liquid
1.86
0.133
Cd(CHO2)2
8.44
0.464
C
0.69
1.45
Zn(CHO2)2
Liquid
1.48
0.106
Cd(CHO2)2
9.16
0.506
C
0.73
1.37
Zn(CHO2)2
Liquid
1.02
0.074
Cd(CHO2)2
10.33
0.575
C
0.86
1.16
Zn(CHO2)2
Liquid
0.00
0.00
Cd(CHO2)2
12.45
0.702
D
0.00
0.00
Notes:
a
The molality values were calculated by the compilers.
b
The solid phases are: A = Zn(CHO
2
)
2
•2H
2
O; B = (Zn,Cd)(CHO
2
)
2
•2H
2
O; C = (Cd,Zn)(CHO
2
)
2
•2H
2
O; D = Cd(CHO
2
)
2
•2H
2
O.
Method/Apparatus/Procedure:
The solubility was studied by the KHLOPIN method for isothermal decrease of supersaturation. Equilibrium was reached in about 15-20 h. The concentration of Zn
2+
and Cd
2+
was determined by an atomic absorption method. The solid phase composition was calculated by the variant of Schreinemakers' method for algebraic indirect identification of the solid-phase composition.
1
X-ray powder diffraction analysis was also used.
Source and Purity of Materials:
The formates of zinc and cadmium were prepared by dissolving of zinc hydroxide carbonate and cadmium carbonate, respectively, in diluted (1:1) formic acid at 70-80 °C. The reagents used were p.a. grade.
Estimated Errors:
Solubility: The solubility was determined in a slight excess of formic acid(2 mass %), to suppress salts hydrolysis.
Temperature: Not given.
References:
1
D. Trendafelov and Chr. Balarew, Comm. Dept. Chem. Bulg. Acad. Sci.
1
, 73 (1968).