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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Sodium formate with Formic Acid and Water
Components:
(1) Formic acid; CH2O2; [64-18-6]
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:
Bianco, P.; Haladjian, J.; Sabbah, R., Bull. Soc. Chim. Fr. 7, 2301 (1969).
Variables:
Concentration = Composition at 25 ºC
Prepared By:
T. A. Ageyeva
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility values in the NaCHO
2
-CH
2
O
2
-H
2
O system at 25ºC.
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
32.64
23.45
CH2O2
64.31
68.28
H2O
3.05
8.27
A
NaCHO2
33.59
22.23
CH2O2
57.96
56.68
H2O
8.45
21.1
A
NaCHO2
34.79
21.88
CH2O2
53.06
49.29
H2O
12.15
28.83
A
NaCHO2
35.91
21.37
CH2O2
47.80
42.04
H2O
16.29
36.59
A
NaCHO2
37.81
22.11
CH2O2
44.20
38.19
H2O
17.99
39.70
A
NaCHO2
38.10
22.03
CH2O2
43.00
36.73
H2O
18.90
41.24
A + B
NaCHO2
38.22
22.07
CH2O2
42.78
36.51
H2O
19.00
41.42
B
NaCHO2
38.69
21.58
CH2O2
39.52
32.56
H2O
21.79
45.86
B
NaCHO2
39.78
20.95
CH2O2
33.63
26.18
H2O
26.59
52.87
B
NaCHO2
40.24
19.91
CH2O2
27.72
20.26
H2O
32.04
59.83
B
NaCHO2
41.82
19.89
CH2O2
22.29
15.67
H2O
35.89
64.44
B
NaCHO2
46.68
20.74
CH2O2
9.93
6.52
H2O
43.39
72.74
B
NaCHO2
47.60
21.05
CH2O2
8.37
5.47
H2O
44.03
73.48
B
NaCHO2
48.00
20.91
CH2O2
6.40
4.12
H2O
45.60
74.97
B + C
NaCHO2
48.21
20.95
CH2O2
5.89
3.78
H2O
45.90
75.27
C
NaCHO2
48.62
20.60
CH2O2
2.84
1.78
H2O
48.54
77.62
C
Notes:
a
These values were calculated by the compiler.
b
The solid phases are: A = NaCHO
2
•CH
2
O
2
; B = 3NaCHO
2
•CH
2
O
2
; C = NaCHO
2
.
Method/Apparatus/Procedure:
The isothermal method was used. The sodium formate content was determined by potentiometric titration. The solid phase was identified by thermogravimetry and Schreinemakers method.
Source and Purity of Materials:
Analytical NaCHO
2
was used as received. Commercial a.r. grade formic acid contained less than 2 % water. Deionized water was used.
Estimated Errors:
Temperature: The temperature was controlled to within ± 0.05 °C. For the solubility it was ± 1%.