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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Strontium formate with Copper formate and Water
Components:
(1) Copper formate; Cu(CHO2)2; [544-19-4]
NIST Chemistry WebBook
for detail
(2) Strontium formate; Sr(CHO2)2; [592-89-2]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Vasileva, V., Cryst. Res.Technol. 30, 339-343 (1995).
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 Sr(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
Cu(CHO2)2
Liquid
25.17
2.190
Sr(CHO2)2
0.00
0.00
A
Cu(CHO2)2
Liquid
23.35
2.74
Sr(CHO2)2
6.73
0.542
A
Cu(CHO2)2
Liquid
22.81
2.291
Sr(CHO2)2
12.30
1.068
A
Cu(CHO2)2
Liquid
24.01
2.673
Sr(CHO2)2
17.50
1.684
A
Cu(CHO2)2
Liquid
25.07
2.929
Sr(CHO2)2
19.20
1.939
eutonic
Cu(CHO2)2
Liquid
24.31
2.800
Sr(CHO2)2
19.16
1.902
B
Cu(CHO2)2
Liquid
21.98
2.433
Sr(CHO2)2
19.20
1.837
B
Cu(CHO2)2
Liquid
19.86
2.133
Sr(CHO2)2
19.53
1.814
B
Cu(CHO2)2
Liquid
17.51
1.813
Sr(CHO2)2
19.60
1.754
B
Cu(CHO2)2
Liquid
15.68
1.585
Sr(CHO2)2
19.90
1.713
B
Cu(CHO2)2
Liquid
14.10
1.417
Sr(CHO2)2
21.02
1.826
eutonic
Cu(CHO2)2
Liquid
12.60
1.221
Sr(CHO2)2
20.23
1.695
C
Cu(CHO2)2
Liquid
8.01
0.706
Sr(CHO2)2
18.13
1.382
C
Cu(CHO2)2
Liquid
4.75
0.399
Sr(CHO2)2
17.76
1.290
C
Cu(CHO2)2
Liquid
0.00
0.00
Sr(CHO2)2
17.16
1.166
C
Notes:
a
The molality values were calculated by the compilers.
b
The solid phases are: A = Cu(CHO
2
)
2
•2H
2
O; B = CuSr(CHO
2
)
4
•4H
2
O; C = Sr(CHO
2
)
2
•2H
2
O.
Method/Apparatus/Procedure:
The solubility in the system was studied by the Khlopin method of isothermal decrease of supersaturation.
1
Equilibrium was reached in 10-15 hr. Cu
2+
was determined complexometrically at pH 5.5-6.0 using Xylenol Orange as indicator. Sr
2+
was also determined complexometrically at
p
H 11 using Thymolphtalexon as indicator. The solid phase composition was determined by the graphic method of Schreinemakers for wet residues. X-ray diffraction analysis, DT and TG analysis were also used.
Source and Purity of Materials:
The formates of copper and strontium were prepared by dissolving copper carbonate, and strontium carbonate respectively, in diluted formic acid. The reagents used were "p.a.".
Estimated Errors:
Temperature: Not given.
References:
1
Chr. Balarew, V. Karaivanova, and T. Oikova, Comm. Dept. Chem. Bulg. Acad. Sci.
3
, 637 (1970).