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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Magnesium formate with Zinc formate and Water
Components:
(1) Magnesium formate; Mg(CHO2)2; [557-39-1]
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:
Stoilova, D.; Balarew, C.; Vassileva, V., St. Russeva, Zh. Neorg. Khim. 26, 1641 (1981).
Variables:
Concentration = Composition at 80 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 Mg(CHO
2
)
2
-Zn(CHO
2
)
2
-H
2
O system at 80 °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
Mg2+/Zn2+
Distribution Coefficient
Zn2+/Mg2+
Zn(CHO2)2
Liquid
14.88
1.125
Mg(CHO2)2
0.00
0.00
A
---
---
Zn(CHO2)2
Liquid
13.93
1.055
Mg(CHO2)2
1.11
0.114
B
0.34
2.94
Zn(CHO2)2
Liquid
11.45
0.871
Mg(CHO2)2
3.96
0.409
B
0.33
3.03
Zn(CHO2)2
Liquid
10.57
0.807
Mg(CHO2)2
5.16
0.536
B
0.35
2.86
Zn(CHO2)2
Liquid
9.86
0.757
Mg(CHO2)2
6.33
0.661
B
0.36
3.00
Zn(CHO2)2
Liquid
9.15
0.708
Mg(CHO2)2
7.69
0.809
B
0.43
2.33
Zn(CHO2)2
Liquid
7.05
0.540
Mg(CHO2)2
9.01
0.939
B
0.44
2.27
Zn(CHO2)2
Liquid
6.51
0.504
Mg(CHO2)2
10.41
1.096
B
0.43
2.33
Zn(CHO2)2
Liquid
4.28
0.331
Mg(CHO2)2
12.54
1.318
B
0.47
2.13
Zn(CHO2)2
Liquid
4.13
0.320
Mg(CHO2)2
12.80
1.348
B
0.56
1.79
Zn(CHO2)2
Liquid
3.34
0.257
Mg(CHO2)2
13.05
1.365
B
0.65
1.54
Zn(CHO2)2
Liquid
2.19
0.168
Mg(CHO2)2
13.94
1.454
B
0.64
1.56
Zn(CHO2)2
Liquid
1.02
0.079
Mg(CHO2)2
16.18
1.709
B
0.72
1.39
Zn(CHO2)2
Liquid
0.00
0.00
Mg(CHO2)2
16.52
1.731
C
---
---
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,Mg)(CHO
2
)
2
•2H
2
O; C = Mg(CHO
2
)
2
•2H
2
O.
Method/Apparatus/Procedure:
Equilibrium was reached in 15-20 hrs using the isothermal decrease of supersaturation method. The sum of the Mg
2+
and Zn
2+
content of both phases was determined using Complexon III at
p
H 9-10 and Eriochrome Black T as indicator. Zn
2+
was determined using Complexon III at
p
H 5.5-6.0 with Xylenol Orange as indicator. The composition of the suction-dried mixed crystals was determined by the method of algebraic indirect identification of the solid phase.
1
Source and Purity of Materials:
The zinc and magnesium formates were prepared by dissolving the normal or basic carbonates in dilute formic acid.
Estimated Errors:
Solubility: The solubilities were determined in a slight excess of formic acid.
Temperature: Not given.
References:
1
D. Trendafelov and Chr. Balarew, Comm. Dept. Chem. Bulg. Acad. Sci.
1
, 73 (1968).