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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Lithium formate with Cobalt formate and Water
Components:
(1) Cobalt formate; Co(CHO2)2; [544-18-3]
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:
Ahmatova, Zh. T.; Borina, A.F.; Lyashchenko, A.K.; Portnova, S.M., Zh. Neorg. Khim. 31, 237-42 (1986).
Variables:
Concentration = Composition at 25 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
-Co(CHO
2
)
2
-H
2
O system at 25 °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
---
---
Co(CHO2)2
2.42
0.166
A
LiCHO2
Liquid
2.47
0.495
Co(CHO2)2
1.44
0.101
A
LiCHO2
Liquid
6.14
1.27
Co(CHO2)2
0.53
0.038
A
LiCHO2
Liquid
8.83
1.87
Co(CHO2)2
0.37
0.027
A
LiCHO2
Liquid
13.10
2.911
Co(CHO2)2
0.28
0.022
A
LiCHO2
Liquid
16.99
3.950
Co(CHO2)2
0.23
0.018
A
LiCHO2
Liquid
20.21
4.888
Co(CHO2)2
0.22
0.018
A
LiCHO2
Liquid
22.16
5.495
Co(CHO2)2
0.22
0.019
A
LiCHO2
Liquid
22.98
5.760
Co(CHO2)2
0.23
0.020
A
LiCHO2
Liquid
24.78
6.372
Co(CHO2)2
0.37
0.033
A+B
LiCHO2
Liquid
25.00
6.451
Co(CHO2)2
0.41
0.037
A+B
LiCHO2
Liquid
26.80
7.068
Co(CHO2)2
0.22
0.020
B
LiCHO2
Liquid
27.47
7.310
Co(CHO2)2
0.20
0.018
B
LiCHO2
Liquid
27.56
7.350
Co(CHO2)2
0.27
0.025
B
LiCHO2
Liquid
28.02
7.508
Co(CHO2)2
0.15
0.014
B
LiCHO2
Liquid
27.85
7.429
Co(CHO2)2
---
---
B
Notes:
a
The solid phases are: A = Co(CHO
2
)
2
•2H
2
O ; B = LiCHO
2
•H
2
O.
Method/Apparatus/Procedure:
The isothermal method was used. Three weeks were allowed for equilibration. The lithium content of both phases was determined by flame photometry. The cobalt content was determined complexometrically by back titration with ZnSO
4
at
p
H 5.5-6.0 using Xylenol Orange as indicator. The composition of the solid phases was determined by Schreinemakers' method.
Source and Purity of Materials:
The lithium formate was obtained by recrystallizing "pro analysis" LiCHO
2
•H
2
O. Cobalt formate dihydrate was prepared by treating p.a. cobalt nitrate with KOH to ppt the hydroxide and then dissolving the hydroxide in a formic acid solution.
Estimated Errors:
Solubility: No information is given.
Temperature: No information is given.