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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Sodium formate with Formic acid and Acetone
Components:
(1) Acetone; C3H6O; [67-64-1]
NIST Chemistry WebBook
for detail
(2) Formic acid; CH2O2; [64-18-6]
NIST Chemistry WebBook
for detail
(3) Sodium formate; NaCHO2; [141-53-7]
NIST Chemistry WebBook
for detail
Original Measurements:
Bianco, P.; Haladjian, J.; Lanza, E, M. Asso, Bull. Soc. Chim. Fr. 1253 (1971).
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
-C
3
H
6
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
32.5
24.6
CH2O2
66.9
74.9
C3H6O
0.6
0.5
A
NaCHO2
30.5
23.3
CH2O2
62.8
70.8
C3H6O
6.7
6.0
A
NaCHO2
28.0
21.4
CH2O2
59.6
67.4
C3H6O
12.4
11.1
A
NaCHO2
19.5
15.2
CH2O2
48.0
55.2
C3H6O
32.5
29.6
A
NaCHO2
15.3
12.1
CH2O2
40.2
46.8
C3H6O
44.5
41.1
A
NaCHO2
13.0
10.3
CH2O2
37.6
44.0
C3H6O
49.4
45.8
A
NaCHO2
7.07
5.69
CH2O2
27.5
32.7
C3H6O
65.4
61.6
A + B
NaCHO2
6.51
5.25
CH2O2
25.8
30.8
C3H6O
67.7
64.0
B
NaCHO2
6.28
5.10
CH2O2
23.2
27.8
C3H6O
70.5
67.1
B
NaCHO2
4.04
3.32
CH2O2
17.3
21.0
C3H6O
78.7
75.7
B
NaCHO2
2.59
2.14
CH2O2
13.4
16.4
C3H6O
84.0
81.5
B
NaCHO2
1.00
0.84
CH2O2
7.15
8.87
C3H6O
91.85
90.29
B
NaCHO2
0.17
0.14
CH2O2
3.02
3.78
C3H6O
96.81
96.08
B
NaCHO2
0.23
0.20
CH2O2
2.50
3.13
C3H6O
97.27
96.67
B + C
NaCHO2
0.23
0.20
CH2O2
2.15
2.70
C3H6O
97.62
97.10
C
NaCHO2
0.23
0.20
CH2O2
0.87
1.1
C3H6O
98.9
98.7
C
NaCHO2
0.00014
0.00012
CH2O2
0.0
0.0
C3H6O
100
100
C
Notes:
a
These values were calculated by the compiler.
b
The solid phases arre: 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. Equilibrium was reached within 24 hours. The sodium formate content was determined by potentiometric titration in a medium containing at least 50% acetone. Formic acid was determined by acidimetry. Acetone was determined spectrophotometrically using λ = 275 nm. The solid phase was determined by thermogravimetry.
Source and Purity of Materials:
Commercial NaCHO
2
was dehydrated and dried at 413.2 K for 48 hours. Formic acid was purified by the method of Wehman and Popov.
1
Purity: 99.9 ± 0.2 %. Commercial acetone was purified by drying with anhydrous CaSO
4
.
2
It contained 0.03% ± 0.01 % water.
Estimated Errors:
Temperature: The temperature was controlled to within ± 0.05 °C. Nothing else was specified.
References:
1
T. C. Wehman and A. I. Popov, J. Phys. Chem.
72
, 4031 (1968).
2
A. Weisberger and E. S. Proskauer,
Techniques of Organic Chemistry
, VII Organic Solvents, Interscience, New York, p. 293 (1955).