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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Lithium formate with Rubidium formate and Water
Components:
(1) Lithium formate; LiCHO2; [556-63-8]
NIST Chemistry WebBook
for detail
(2) Rubidium formate; RbCHO2; [3495-35-0]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Itkina, L.S.; Petrova, E., Zh. Neorg. Khim. 24, 1103-9 (1979); Russ. J. Inorg. Chem. (Engl. Transl.) 24, 613-8 (1979).
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
- RbCHO
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
27.99
7.481
RbCHO2
---
---
A
LiCHO2
Liquid
20.21
6.866
RbCHO2
23.14
3.130
A
LiCHO2
Liquid
20.59
7.696
RbCHO2
27.92
4.155
A
LiCHO2
Liquid
18.57
8.788
RbCHO2
40.76
7.681
A
LiCHO2
Liquid
19.69
10.94
RbCHO2
45.68
10.11
A
LiCHO2
Liquid
19.24
11.52
RbCHO2
48.61
11.59
A
LiCHO2
Liquid
22.61
21.26
RbCHO2
56.92
21.31
A+B
LiCHO2
Liquid
13.93
15.00
RbCHO2
68.20
29.25
B
LiCHO2
Liquid
13.48
13.92
RbCHO2
67.88
27.91
B
LiCHO2
Liquid
10.18
10.95
RbCHO2
71.92
30.79
B
LiCHO2
Liquid
8.39
10.1
RbCHO2
75.56
36.08
B
LiCHO2
Liquid
7.26
5.29
RbCHO2
66.30
19.22
B
LiCHO2
Liquid
5.99
4.55
RbCHO2
68.69
20.79
B+C
LiCHO2
Liquid
2.25
1.54
RbCHO2
69.57
18.93
C
LiCHO2
Liquid
3.59
3.36
RbCHO2
75.82
28.22
C
LiCHO2
Liquid
3.22
3.15
RbCHO2
77.11
30.04
C
LiCHO2
Liquid
2.77
3.27
RbCHO2
80.93
38.05
C
LiCHO2
Liquid
2.17
2.90
RbCHO2
83.43
44.40
C
LiCHO2
Liquid
---
---
RbCHO2
82.26
35.53
C
Notes:
a
The solid phase are: A = LiCHO
2
•H
2
O; B = LiCHO
2
•RbCHO
2
•0.5H
2
O; C = RbCHO
2
•H
2
O.
Method/Apparatus/Procedure:
The isothermal method was used. Equilibrium was reached in 6 days. The lithium content of both phases was determined by flame photometry. The rubidium content was determined as the difference between the total formate content and the amount of formate present as lithium formate. This was done either permanganometrically or by the tetraphenyl borate method. The composition of the solid phases was determined by Schreinemakers' method.
Source and Purity of Materials:
LiCHO
2
was prepared by heating p.a. grade LiCHO
2
•H
2
O at 120 °C. RbCHO
2
was obtained by neutralizing 85% p.a. grade formic acid with RbOH. After evaporation up to 155 °C and then cooling, the crystals were washed with ethanol and dried over H
2
SO
4
in a vacuum.
Estimated Errors:
Solubility: No information is given.
Temperature: No information is given.