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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Nickel formate with Copper formate and Water
Components:
(1) Copper formate; Cu(CHO2)2; [544-19-4]
NIST Chemistry WebBook
for detail
(2) Nickel formate; Ni(CHO2)2; [3349-06-2]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Stoilova, D.; Risova, D. Bulg. Chem. Commun. 26, 268-273 (1993).
Variables:
Concentration = Composition at 50 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
-Cu(CHO
2
)
2
-H
2
O system at 50 °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
Ni2+/Cu2+
Distribution Coefficient
Cu2+/Ni2+
Cu(CHO2)2
Liquid
25.17
2.190
Ni(CHO2)2
0.00
0.00
A
---
---
Cu(CHO2)2
Liquid
25.03
2.207
Ni(CHO2)2
1.15
0.105
B
0.72
1.39
Cu(CHO2)2
Liquid
24.95
2.218
Ni(CHO2)2
1.81
0.166
B
2.04
0.49
Cu(CHO2)2
Liquid
22.80
1.975
Ni(CHO2)2
2.04
0.184
B
3.88
0.26
Cu(CHO2)2
Liquid
22.54
1.944
Ni(CHO2)2
1.97
0.175
B
4.57
0.22
Cu(CHO2)2
Liquid
20.19
1.749
Ni(CHO2)2
1.62
0.145
eutonic
Cu(CHO2)2
Liquid
20.10
1.675
Ni(CHO2)2
1.79
0.154
eutonic
Cu(CHO2)2
Liquid
20.63
1.723
Ni(CHO2)2
1.42
0.122
eutonic
Cu(CHO2)2
Liquid
17.14
1.377
Ni(CHO2)2
1.81
0.150
C
9.10
0.11
Cu(CHO2)2
Liquid
12.74
0.974
Ni(CHO2)2
2.12
0.167
C
9.10
0.11
Cu(CHO2)2
Liquid
9.69
0.714
Ni(CHO2)2
1.91
0.145
C
11.76
0.09
Cu(CHO2)2
Liquid
6.32
0.448
Ni(CHO2)2
1.76
0.129
C
11.10
0.09
Cu(CHO2)2
Liquid
4.19
0.292
Ni(CHO2)2
2.32
0.167
C
7.69
0.13
Cu(CHO2)2
Liquid
2.12
0.146
Ni(CHO2)2
3.31
0.235
C
5.55
0.18
Cu(CHO2)2
Liquid
0.00
0.00
Ni(CHO2)2
2.78
0.192
D
---
---
Notes:
a
The molality values were calculated by the compilers.
b
The solid phases are: A = Cu(CHO
2
)
2
•2H
2
O; B = (Cu,Ni)(CHO
2
)
2
•2H
2
O; C = (Ni,Cu)(CHO
2
)
2
•2H
2
O; D = Ni(CHO
2
)
2
•2H
2
O.
Method/Apparatus/Procedure:
The solubility was studied by the method of isothermal decrease of supersaturation. The equilibrium was reached in about two days. The liquid phase concentrations were determined as follows: the sum of the copper and cobalt formate concentrations was determined complexometrically at
p
H 5.5-6.0 using Xylenol orange as indicator, the copper formate concentration was determined iodometrically. The cobalt formate concentration was estimated by difference. The variation of the Schreinemakers method was used for calculation of ideally suction dried solid phase composition.
1
X-ray powder analysis and IR spectra were carried out.
Source and Purity of Materials:
The metal formates were prepared from reaction of the corresponding metal hydroxide carbonates with dilute formic acid solutions at 70-80 °C. The crystals were recrystallized in water and dried in air. The reagents used were p.a.(Merck).
Estimated Errors:
Solubility: The experiments were carried out in presence of a slight excess of formic acid (1-2 mass %) in order to suppress the salt hydrolysis.
Temperature: Not given.
References:
1
D. Trendafelov and Chr. Balarew, Comm. Dept. Chem. Bulg. Acad. Sci.
1
, 73 (1968).