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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Sodium formate with Ethanol and Water
Components:
(1) Ethanol; C2H6O; [64-17-5]
NIST Chemistry WebBook
for detail
(2) Sodium formate; NaCHO2; [141-53-7]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Heubel, J.; Vandorpe, B; Hebd, C.R., Seances Acad. Sci. 254, 3207 (1962).
Variables:
Concentration = Composition at 288.2 K
Prepared By:
T. A. Ageyeva
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility values in the NaCHO
2
-C
2
H
6
O-H
2
O system at 288.2 K.
Chemical
1
Mass Fraction w
1
10
0
* Mole Fraction
1
a
Chemical
2
Mass Fraction w
2
Mole Fraction
2
a
Chemical
3
Mass Fraction w
3
Mole Fraction
3
a
Solid Phase(s)
b
NaCHO2
42.1
16.2
C2H6O
0.0
0.0
H2O
57.9
83.9
A
NaCHO2
40.2
15.6
C2H6O
3.5
2.0
H2O
56.3
82.4
A
NaCHO2
37.4
14.5
C2H6O
7.1
4.1
H2O
55.5
81.4
A
NaCHO2
34.1
13.4
C2H6O
12.3
7.13
H2O
53.6
79.5
A
NaCHO2
30.6
12.3
C2H6O
18.9
11.2
H2O
50.5
76.5
A
NaCHO2
28.9
11.7
C2H6O
21.9
13.1
H2O
49.2
75.2
A
NaCHO2
26.3
10.8
C2H6O
26.2
15.8
H2O
47.5
73.4
A
NaCHO2
24.07
10.08
C2H6O
31.3
19.4
H2O
44.63
70.56
A
NaCHO2
22.8
9.64
C2H6O
33.8
21.1
H2O
43.4
69.3
A + B
NaCHO2
21.2
8.95
C2H6O
35.6
22.2
H2O
43.2
68.9
B
NaCHO2
18.5
7.99
C2H6O
41.1
26.2
H2O
40.4
65.8
B
NaCHO2
14.5
6.44
C2H6O
48.7
31.9
H2O
36.8
61.7
B
NaCHO2
10.0
4.67
C2H6O
59.0
40.7
H2O
31.0
54.7
B
NaCHO2
6.2
3.0
C2H6O
67.4
48.5
H2O
26.4
48.5
B
NaCHO2
4.8
2.4
C2H6O
72.9
54.8
H2O
22.3
42.8
B
NaCHO2
4.0
2.1
C2H6O
75.7
58.1
H2O
20.3
39.8
B
NaCHO2
3.07
1.61
C2H6O
77.8
60.4
H2O
19.13
37.98
B
NaCHO2
2.25
1.25
C2H6O
83.3
68.4
H2O
14.45
30.34
B
NaCHO2
1.95
1.10
C2H6O
84.7
70.5
H2O
13.35
28.41
B + C
NaCHO2
1.0
0.59
C2H6O
69.2
77.6
H2O
9.8
21
C
NaCHO2
0.9
0.5
C2H6O
88.3
75.8
H2O
10.8
23.7
C
NaCHO2
0.4
0.3
C2H6O
93.1
84.6
H2O
6.5
15
C
NaCHO2
0.16
0.10
C2H6O
96.1
90.9
H2O
3.74
9.04
C
NaCHO2
0.2
0.1
C2H6O
99.8
99.9
H2O
0.0
0.0
C
Notes:
a
These values were calculated by the compiler.
b
The solid phases are: A = NaCHO
2
•2H
2
O; B = NaCHO
2
•1.75H
2
O; C = NaCHO
2
.
Method/Apparatus/Procedure:
The isothermal method was used. Equilibrium was achieved within several hours. The NaCHO
2
content was determined gravimetrically as chloride. Ethanol was determined by the chromic nitrate oxidation method of Cordebart
1
with the difference that the NaCHO
2
was first separated from the solvent by distillation
in vacuo
. The solid phases were identified by the Schreinemakers method.
Source and Purity of Materials:
a. r. grade NaCHO
2
was dehydrated at 273.2 K; m.p. 528.2 ± 1 K. Ethanol was dehydrated over calcium followed by distillation. Source and purity of water are not described.
Estimated Errors:
Temperature: ± 1 K. Nothing else is stated.
References:
1
M. H. Cordebart, J. Pharm. Chem. 30, 263 (1939).