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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Copper(II)formate with Formic acid and Water
Components:
(1) Formic acid; CH2O2; [64-18-6]
NIST Chemistry WebBook
for detail
(2) Copper(II) formate; Cu(CHO2)2; [544-19-4]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Kalalova, E., Scientific papers of the Inst. Of Chem. Technol., Prague 9, 37 (1966).
Variables:
Temperature = 0 ºC to 100 ºC
Prepared By:
T. A. Ageyeva
Experimental Remarks:
Transition points: Tetrahydrate to dihydrate is 317.7 ± 0.5 K. Dihydrate to anhydrous salt is 332 ± 1 K.
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility of copper(II)formate in 2% formic acid.
t/°C
Mass Fraction w
1
10
0
* Mole Fraction
1
a
Solid Phase(s)
b
0
2.9
0.34
A
10
4.6
0.54
A
20
7.7
0.91
A
30
13.2
1.54
A
40
24.1
2.78
A
45
29.5
3.39
B
50
33.9
3.87
B
58
48.5
5.45
B
60
50.7
5.68
C
70
49.1
5.51
C
80
47.2
5.31
C
85
47.8
5.37
C
90
50.6
5.67
C
100
61.3
6.77
C
Notes:
a
These values were calculated by the compiler.
b
The solid phases are: A = Cu(CHO
2
)
2
•4H
2
O; B = Cu(CHO
2
)
2
•2H
2
O; C = Cu(CHO
2
)
2
.
Method/Apparatus/Procedure:
The isothermal method was used. Equilibrium was reached within 20 h. The copper content was measured by electrolytic deposition at a platinum cathode from a solution acidified with HNO
3
. The solid phase was identified by thermogravimetric and x-ray methods. Transition points between phases were determined thermogravimetrically. The solubility of each hydrate and the anhydrous salt were investigated.
Source and Purity of Materials:
Cu(CHO
2
)
2
•4H
2
O was prepared by dissolving CuO in 50% formic acid followed by filtration and drying. Copper content was 28.16 mass % (calcd value is 28.16 mass %). The dihydrate was prepared by recrystallization of Cu(CHO
2
)
2
in a thermostat at 323 K followed by filtration and drying at the same temperature. Copper content was 33.45 mass % (calcd value is 33.52 mass %). Anhydrous Cu(CHO
2
)
2
was prepared from the dihydrate at 368 K. Copper content was 41.35 mass % (calcd value is 41.39 mass %). Source and purity of formic acid and water are not described.
Estimated Errors:
Solubility: No information is given.
Temperature: The temperature was controlled to within ±0.2 K. No other information is given.