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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Lithium formate with Potassium formate and Water
Components:
(1) Potassium formate; KCHO2; [590-29-4]
NIST Chemistry WebBook
for detail
(2) Lithium formate; LiCHO2; [556-63-8]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Itkina, L.S.; Chaplygina, N.M.; Petrova, E.V., Zh. Neorg. Khim. 24, 788-94 (1979); Russ. J. Inorg. Chem. (Engl. Transl.) 24, 440-3 (1979).
Variables:
Concentration = Composition at 100 ºC
Prepared By:
Chr. Balarew and St. Trendafilova
Experimental Remarks:
The molality values were calculated by the compilers.
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility values in the LiCHO
2
-KCHO
2
-H
2
O system at 100 °C.
Chemical
1
Phase
Mass Fraction w
1
m
1
[mol kg-1]
Chemical
2
Mass Fraction w
2
m
2
[mol kg-1]
Solid Phase(s)
a
LiCHO2
Liquid phase
58.32
26.93
KCHO2
---
---
A
LiCHO2
Liquid phase
49.71
24.11
KCHO2
10.61
3.179
A
LiCHO2
Liquid phase
48.82
27.68
KCHO2
17.23
6.033
A
LiCHO2
Liquid phase
43.64
28.77
KCHO2
27.16
11.06
A
LiCHO2
Liquid phase
40.72
34.05
KCHO2
36.26
18.73
A
LiCHO2
Liquid phase
39.76
38.96
KCHO2
40.60
24.57
A
LiCHO2
Liquid phase
39.61
44.25
KCHO2
43.16
29.78
A+B
LiCHO2
Liquid phase
37.65
41.06
KCHO2
44.70
30.11
B
LiCHO2
Liquid phase
31.16
40.88
KCHO2
54.17
43.90
B
LiCHO2
Liquid phase
28.23
36.13
KCHO2
56.73
44.84
B
LiCHO2
Liquid phase
15.72
55.52
KCHO2
78.83
171.9
B
LiCHO2
Liquid phase
15.12
43.89
KCHO2
78.25
140.3
B
LiCHO2
Liquid phase
12.88
30.83
KCHO2
79.08
116.9
B+C
LiCHO2
Liquid phase
13.40
28.95
KCHO2
77.69
103.7
C
LiCHO2
Liquid phase
16.25
33.34
KCHO2
74.37
94.25
C
LiCHO2
Liquid phase
14.67
22.20
KCHO2
72.61
67.86
C
LiCHO2
Liquid phase
14.23
21.93
KCHO2
73.28
69.75
C
LiCHO2
Liquid phase
8.24
8.60
KCHO2
73.32
47.27
C
LiCHO2
Liquid phase
---
---
KCHO2
94.60
208.26
C
Notes:
a
The solid phase are: A = LiCHO
2
; B = LiCHO
2
•KCHO
2
; C = KCHO
2
.
Method/Apparatus/Procedure:
The isothermal method was used. Two weeks in a furnace equipped with Teflon vessels were allowed for equilibration. The lithium content of both phases was determined by flame photometry. The potassium content was determined by flame photometry and by the tetraphenyl borate method. The composition of the solid phases was determined by Schreinemakers' method.
Source and Purity of Materials:
The lithium and potassium formates were prepared by neutralizing 85% formic acid with the corresponding pro analysis grade hydroxides. After evaporation, the salts were washed with ethanol and dried over H
2
SO
4
. The products were LiCHO
2
•H
2
O and KCHO
2
. Anhydrous LiCHO
2
was obtained by drying the hydrate at 100-110 °C in a N
2
atmosphere.
Estimated Errors:
Solubility: No information is given.
Temperature: No information is given.