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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Copper(II)formate with Ammonium formate and Formic acid
Components:
(1) Ammonium formate; NH4CHO2; [540-69-2]
NIST Chemistry WebBook
for detail
(2) Formic acid; CH2O2; [64-18-6]
NIST Chemistry WebBook
for detail
(3) Copper(II) formate; Cu(CHO2)2; [544-19-4]
NIST Chemistry WebBook
for detail
Original Measurements:
Davidson, A.W.; Holm, V., J. Am. Chem. Soc. 53, 1350 (1931).
Variables:
Temperature = 31 ºC to 77 ºC
Prepared By:
T. A. Ageyeva
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility in the Cu(CHO
2
)
2
-NH
4
CHO
2
-CH
2
O
2
system.
t/°C
10
0
* Mole Fraction
1
Mass Ratio
a
Solid Phase(s)
65.0
0.076
0.1
Cu(CHO2)2 (b)
71.0
0.083
0.1
Cu(CHO2)2 (b)
77.0
0.098
0.1
Cu(CHO2)2 (b)
60.0
0.319
0.1973
Cu(CHO2)2 (b)
70.5
0.399
0.1973
Cu(CHO2)2 (b)
77.2
0.465
0.1973
Cu(CHO2)2 (b)
51.5
1.016
0.2975
2Cu(CHO2)2•3CH2O2
68.5
1.286
0.2975
2Cu(CHO2)2•3CH2O2
74.0
1.365
0.2975
2Cu(CHO2)2•3CH2O2
29.0
1.179
0.3354
2Cu(CHO2)2•3CH2O2
31.0
1.308
0.3354
2Cu(CHO2)2•3CH2O2
33.0
1.501
0.3354
2Cu(CHO2)2•3CH2O2
38.5
1.680
0.3354
2Cu(CHO2)2•3CH2O2
43.0
1.950
0.3354
2Cu(CHO2)2•3CH2O2
44.0
2.004
0.3354
2Cu(CHO2)2•3CH2O2
37.0
1.990
0.4375
2Cu(CHO2)2•3CH2O2
43.5
2.470
0.4375
2Cu(CHO2)2•3CH2O2
48.5
2.816
0.4375
2Cu(CHO2)2•3CH2O2
51.5
3.131
0.4375
2Cu(CHO2)2•3CH2O2
Notes:
a
R
= Number of molecules of NH
4
CHO
2
/Number of molecules (NH
4
CHO
2
+ CH
2
O
2
).
b
The authors make the following comment about this solid phase: “it contained no ammonia and therefore consisted of Cu(CHO
2
)
2
, presumably solvated.”
Method/Apparatus/Procedure:
The solubility values were measured by the freezing point method.
1
Samples of solid phase were prepared for analysis by crystallizing from solution, filtering and drying between porous tiles. A quantitative determination of copper by the electrolytic method was sufficient to fix the composition of the compound.
Source and Purity of Materials:
The copper salt was prepared by dissolving the basic carbonate in 50% formic acid, heating to expel CO
2
, cooling to precipitate out the crystals, pressing the crystals between porous tiles and drying them at 348 K for 10 h. The ammonium formate was prepared by passing dry NH
3
into 100% formic acid and drying the product over 99% sulfuric acid; melting point = 390-391 K. Formic acid was prepared by treating the 90% acid with B
2
O
3
; melting point = 281.4-281.7 K.
Estimated Errors:
Solubility: No information is given.
Temperature: ± 0.5 K
References:
1
A. W. Davidson and W. H. McAllister, J. Am. Chem. S.
52
, 507 (1930).