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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Sodium formate with Potassium formate and Water
Components:
(1) Potassium formate; KCHO2; [590-29-4]
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:
Itkina, L.S.; Petrova, E.V., Zh. Neorg. Khim. 27, 517-9 (1982); Russ. J. Inorg. Chem. (Engl. Transl.) 27, 294-6 (1982).
Variables:
Concentration = Composition at 25 ºC
Prepared By:
Chr. Balarew and St. Trendafilova
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility values in the NaCHO
2
-KCHO
2
-H
2
O system at 25 °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
Solid Phase(s)
b
NaCHO2
Liquid
50.97
15.28
KCHO2
---
---
A
NaCHO2
Liquid
49.10
14.95
KCHO2
2.62
0.645
A
NaCHO2
Liquid
27.12
9.117
KCHO2
29.15
7.926
A
NaCHO2
Liquid
21.80
12.73
KCHO2
53.03
25.05
A
NaCHO2
Liquid
23.51
17.69
KCHO2
56.95
34.66
A+B
NaCHO2
Liquid
22.98
15.47
KCHO2
55.18
30.04
B
NaCHO2
Liquid
19.94
12.89
KCHO2
57.31
29.95
B
NaCHO2
Liquid
14.48
8.826
KCHO2
61.40
30.27
B
NaCHO2
Liquid
12.86
7.651
KCHO2
62.43
30.04
B
NaCHO2
Liquid
10.33
6.825
KCHO2
67.42
36.03
B
NaCHO2
Liquid
5.84
4.35
KCHO2
74.41
44.80
B+C
NaCHO2
Liquid
2.95
1.80
KCHO2
72.91
35.91
C
NaCHO2
Liquid
3.32
2.15
KCHO2
73.94
38.66
C
NaCHO2
Liquid
-
-
KCHO2
81.82
53.51
C
Notes:
a
The molality values were calculated by the compilers.
b
The solid phases are: A =NaCHO
2
; B = NaCHO
2
•2.5KCHO
2
; C = KCHO
2
.
Method/Apparatus/Procedure:
The isothermal method was used. Two weeks were allowed for equilibration. The potassium content was determined by flame photometry. Formate ion content was determined permanganometrically. Sodium ion content was determined by the difference. The composition of the solid phases was determined by Schreinemakers' method.
Source and Purity of Materials:
The sodium and potassium formates were prepared by neutralizing formic acid with the corresponding pro analysis grade hydroxides.
Estimated Errors:
Solubility: No information is given.
Temperature: No information is given.