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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Nickel formate with Zinc formate and Water
Components:
(1) Nickel formate; Ni(CHO2)2; [3349-06-2]
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:
Balarew, C.C.; Vassileva, V.Z., Compt. Rend. Acad. Bulg. Sci. 43, 51-4 (1990).
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 Ni(CHO
2
)
2
-Zn(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
Zn2+/Ni2+
Distribution Coefficient
Ni2+/Zn2+
Ni(CHO2)2
Liquid
2.14
0.146
Zn(CHO2)2
---
---
A
---
---
Ni(CHO2)2
Liquid
1.75
0.121
Zn(CHO2)2
0.75
0.049
B
0.59
1.68
Ni(CHO2)2
Liquid
1.18
0.081
Zn(CHO2)2
1.45
0.096
B
0.58
1.73
Ni(CHO2)2
Liquid
1.06
0.073
Zn(CHO2)2
1.80
0.119
B
0.55
1.80
Ni(CHO2)2
Liquid
0.76
0.053
Zn(CHO2)2
2.50
0.166
B
0.39
2.59
Ni(CHO2)2
Liquid
0.42
0.029
Zn(CHO2)2
3.28
0.219
B
0.20
4.89
Ni(CHO2)2
Liquid
0.19
0.013
Zn(CHO2)2
3.60
0.241
B
0.12
8.37
Ni(CHO2)2
Liquid
0.06
0.004
Zn(CHO2)2
4.42
0.298
B
0.11
8.86
Ni(CHO2)2
Liquid
---
---
Zn(CHO2)2
5.38
0.366
C
---
---
Notes:
a
The molality values were calculated by the compilers.
b
The solid phases are: A = Ni(CHO
2
)
2
•2H
2
O; B = (Ni,Zn)(CHO
2
)
2
•2H
2
O; C = Zn(CHO
2
)
2
•2H
2
O.
Method/Apparatus/Procedure:
The method used was the isothermal decrease of supersaturation, for 15-20 hrs. The Ni
2+
content of the liquid and solid phases was determined gravimetrically with dimethylglyoxime. The sum of Ni
2+
and Zn
2+
was determined complexometrically by back titration in excess of Complexon III with ZnSO
4
at
p
H 5.5-6 using Xylenol Orange as indicator. The composition of the suction-dried mixed crystals was determined by the algebraic indirect identification of the solid phase composition method.
1
Source and Purity of Materials:
The reagents used were of p.a. grade. Nickel and zinc formates were prepared by the action of dilute formic acid with nickel and zinc carbonates, respectively.
Estimated Errors:
Solubility: The solubility of the salts was determined in a slight excess of formic acid (about 2%) to suppress salt hydrolysis.
Temperature: Not given.
References:
1
D. Trendafelov and Chr. Balarew, Comm. Dept. Chem. Bulg. Acad. Sci.
1
, 73 (1968).