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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:
Portnova, S.M., Petrova, E.V., Zh. Neorg. Khim. 30, 1838-43 (1985); Russ. J. Inorg. Chem. (Engl. Transl.) 30, 1045-8 (1985).
Variables:
Temperature = 25 ºC to 273 ºC.
Prepared By:
St. Tepavitcharova and St. Trendafilova
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.
t/°C
Chemical
1
Phase
Mass Fraction w
1
a
10
0
* Mole Fraction
1
m
1
[mol kg-1]
Chemical
2
Mass Fraction w
2
a
Mole Fraction
2
m
2
[mol kg-1]
Solid Phase(s)
b
25
LiCHO2
Liquid phase
24.86
17.65
15.58
KCHO2
44.43
19.48
17.20
A+B
25
LiCHO2
Liquid phase
9.84
7.51
6.55
KCHO2
61.23
28.85
25.16
B+C
25(c)
LiCHO2
Liquid phase
27.12
21.14
21.08
KCHO2
48.12
23.17
23.10
A
25(c)
LiCHO2
Liquid phase
24.42
18.80
18.11
KCHO2
49.63
23.60
22.74
A
25(c)
LiCHO2
Liquid phase
24.94
19.35
18.88
KCHO2
49.64
23.79
23.21
A
25(c)
LiCHO2
Liquid phase
23.28
17.69
16.66
KCHO2
49.83
23.39
22.03
A
28(d)
LiCHO2
Liquid phase
23.74
17.68
16.33
KCHO2
48.28
22.21
20.51
A
30
LiCHO2
Liquid phase
25.84
20.33
20.32
KCHO2
49.68
24.17
24.13
A+B+D
50
LiCHO2
Liquid phase
36.31
31.51
40.02
KCHO2
46.23
24.78
31.48
A+D
50
LiCHO2
Liquid phase
87.80
6.9
7.25
KCHO2
71.49
39.53
41.04
C+D
100
LiCHO2
Liquid phase
39.61
34.08
43.94
KCHO2
43.04
22.87
29.49
D+E
100
LiCHO2
Liquid phase
12.96
15.24
30.79
KCHO2
78.94
57.32
115.9
C+D
118
LiCHO2
Liquid phase
60.51
71.27
---
KCHO2
39.49
28.73
---
C+D
140
LiCHO2
Liquid phase
25.01
35.06
---
KCHO2
74.99
64.94
---
D+E
160
LiCHO2
Liquid phase
7.46
38.02
---
KCHO2
2.54
62.07
---
D
167
LiCHO2
Liquid phase
0.0
0.0
---
KCHO2
100.0
100.0
---
C
273
LiCHO2
Liquid phase
100.0
100.0
---
KCHO2
0.0
0.0
---
E
Notes:
a
These values and the molality values were calculated by the compilers.
b
The solid phases are: A = LiCHO
2
•H
2
O; B = LiCHO
2
•KCHO
2
•0.5H
2
O; C = KCHO
2
; D = LiCHO
2
•KCHO
2
; E = LiCHO
2
.
c
Metastable condition; values taken from Ref.3.
d
Metastable condition.
Method/Apparatus/Procedure:
The isothermal method was used at 28 and 30 °C. Equilibrium was reached within 4 weeks. The potassium and lithium content of both phases was determined by flame photometry.
1
The potassium content of the solid phase was also determined by the tetraphenylborate method in an acetic acid medium.
2
No experimental details are given for the other temperatures.
Source and Purity of Materials:
Estimated Errors:
Solubility: Analytical error is ± 5%
References:
1
N. S. Poluektov,
Methods of Analysis by Flame Photometry
(Russ), 2nd ed. (Khimiya, Moscow, 1967), p.308.
2
G. G. Russakova, Zh. Anal. Khim.
18
, 154 (1963).
3
L. S. Itkina, N. M. Chaplygina, and E. V. Petrova, Zh. Neorg. Khim.
24
, 788 (1979).