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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Sodium formate with Sodium hydroxide and Water
Components:
(1) Sodium formate; NaCHO2; [141-53-7]
NIST Chemistry WebBook
for detail
(2) Sodium hydroxide; NaOH; [1310-73-2]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Centola, G.P.; Rosso, E.R.; Mazzoccia, V.C., J. Chem. Eng. Data 25, 170-1 (1980).
Variables:
Concentration = Composition at 120 ºC
Prepared By:
Chr. Balarew and St. Trendafilova
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Liquid phase composition of the NaCHO
2
-NaOH-H
2
O system at 120 °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
NaOH
Liquid
0.0
0.0
NaCHO2
65.6
28.0
NaOH
Liquid
12.6
7.39
NaCHO2
44.8
15.5
NaOH
Liquid
15.9
8.21
NaCHO2
35.7
10.8
NaOH
Liquid
36.6
20.2
NaCHO2
18.0
5.83
NaOH
Liquid
37.3
19.8
NaCHO2
15.6
4.87
NaOH
Liquid
79.2
95.2
NaCHO2
0.0
0.0
Notes:
a
These values were calculated by the compilers.
Method/Apparatus/Procedure:
Weighed amounts of NaOH and formic acid were dissolved in deionized water and placed in closed 250 cm
3
flasks. The flasks were placed in a constant temperature bath. Equilibrium was reached in 6 h. Samples were removed after 24 h and analyzed. The sodium formate content was determined by adding excess KMnO
4
and titrating the excess iodometrically. NaOH was determined by titration with formic acid.
Source and Purity of Materials:
Carlo Erba pure reagents were used.
Estimated Errors:
Temperature: Accuracy of temperature measurement was ± 0.05°C.