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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 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 Sr(CHO
2
)
2
-Cu(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
Cu(CHO2)2
Liquid
8.80
0.628
Sr(CHO2)2
0.00
0.00
A
Cu(CHO2)2
Liquid
7.70
0.566
Sr(CHO2)2
3.77
0.374
A
Cu(CHO2)2
Liquid
7.60
0.571
Sr(CHO2)2
5.75
0.374
A
Cu(CHO2)2
Liquid
8.07
0.630
Sr(CHO2)2
8.63
0.583
A
Cu(CHO2)2
Liquid
8.95
0.725
Sr(CHO2)2
10.70
0.750
A
Cu(CHO2)2
Liquid
9.09
0.742
Sr(CHO2)2
11.18
0.789
eutonic
Cu(CHO2)2
Liquid
9.12
0.745
Sr(CHO2)2
11.15
0.787
eutonic
Cu(CHO2)2
Liquid
8.52
0.688
Sr(CHO2)2
10.90
0.761
B
Cu(CHO2)2
Liquid
7.93
0.635
Sr(CHO2)2
10.80
0.748
B
Cu(CHO2)2
Liquid
7.00
0.557
Sr(CHO2)2
11.16
0.767
B
Cu(CHO2)2
Liquid
4.90
0.380
Sr(CHO2)2
11.15
0.747
B
Cu(CHO2)2
Liquid
3.82
0.292
Sr(CHO2)2
10.99
0.726
B
Cu(CHO2)2
Liquid
3.22
0.245
Sr(CHO2)2
11.35
0.748
eutonic
Cu(CHO2)2
Liquid
2.51
0.190
Sr(CHO2)2
11.72
0.769
C
Cu(CHO2)2
Liquid
0.00
0.00
Sr(CHO2)2
12.20
0.782
C
Notes:
a
The molality values were calculated by the compilers.
b
The solid phases are: A = Cu(CHO
2
)
2
•4H
2
O; B = CuSr(CHO
2
)
4
•8H
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
p
H 5.5-6.0 using Xylenol Orange as indicator. Sr
2+
was determined also 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).