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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Strontium formate with Water
Components:
(1) Strontium formate; Sr(CHO2)2; [592-89-2]
NIST Chemistry WebBook
for detail
(2) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Ashton, F.W.; Houston, D.F.; Saylor, C.P., J. Res. Nat. Bur. Stand. 11, 233-53 (1933).
Variables:
Temperature = 0 ºC to 100 ºC.
Prepared By:
Chr.Balarew and St. Trendafilova
Experimental Remarks:
Most of the data are given only in graphical form. The authors’ Table contains interpolated data as well as data from other sources.
1
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility of strontium formate in water.
t/°C
g
1
/g
2
Phase
Mass Fraction w
1
m
1
[mol kg-1]
a
Solid Phase(s)
c
0
9.1 (b)
Liquid
8.3
0.51
A
10
10.6 (b)
Liquid
9.58
0.597
A
20
12.7 (b)
Liquid
11.3
0.715
A
30
15.2 (b)
Liquid
13.2
0.856
A
40
17.8
Liquid
15.1
1.00
A
50
21.0 (b)
Liquid
17.4
1.18
A
60
25.0
Liquid
20.0
1.41
A
70
30.0 (b)
Liquid
23.1
1.69
A
80
31.9 (b)
Liquid
24.2
1.80
B
90
32.9
Liquid
24.8
1.85
B
100
34.4 (b)
Liquid
25.6
1.94
B
Notes:
a
The compilers calculated the molality values as mol/kg.
b
These data were interpolated by the authors.
c
The solid phases are: A = Sr(CHO
2
)
2
•2H
2
O; B = Sr(CHO
2
)
2
.
Method/Apparatus/Procedure:
The isothermal method was used. Samples were taken at 6 and 18 h, filtered into weighing bottles and weighed. They were then evaporated to dryness in an oven at 125 °C, cooled in a desiccator and weighed. From the weight of anhydrous salt thus obtained, the solubility in g/100 g was calculated. The calcium content was determined by dissolving a sample in sulfuric acid, concentrating it by evaporation, and the acid driven off. The residue was then ignited, cooled, and weighed as sulfate.
Source and Purity of Materials:
Strontium formate was prepared by adding Sr(OH)
2
to an excess of formic acid. It was recrystallized in 3 fractions as the dihydrate. The first fraction was recrystallized. The product was dried at 125 °C. A portion was later recrystallized from a slightly acid solution at 80-85°C. The dihydrate is made by recrystallization at room temperature.
Estimated Errors:
Solubility: 0.1 g/100 g H
2
O.
References:
1
H. Stanley, Chem. News
89
, 193 (1904).