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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Lithium formate with Ammonium formate and Water
Components:
(1) Ammonium formate; NH4CHO2; [540-69-2]
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:
Nadzharyan, K.A.; Itkina, L.S., Zh. Neorg. Khim. 26, 1097-1103 (1981); Russ. J. Inorg. Chem. (Engl.Transl.) 26, 595-8 (1981).
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
-NH
4
CHO
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
NH4CHO2
---
---
À
LiCHO2
Liquid
21.05
6.602
NH4CHO2
17.59
4.546
A
LiCHO2
Liquid
21.67
7.219
NH4CHO2
20.56
5.644
A
LiCHO2
Liquid
21.39
8.355
NH4CHO2
29.34
9.443
A
LiCHO2
Liquid
19.95
8.483
NH4CHO2
34.79
12.19
A
LiCHO2
Liquid
21.37
11.06
NH4CHO2
41.44
17.67
A
LiCHO2
Liquid
22.76
13.34
NH4CHO2
44.40
21.44
A+B
LiCHO2
Liquid
21.65
12.53
NH4CHO2
45.09
21.50
B
LiCHO2
Liquid
17.65
9.149
NH4CHO2
45.22
19.31
B
LiCHO2
Liquid
10.52
4.824
NH4CHO2
47.51
17.95
B
LiCHO2
Liquid
5.26
2.26
NH4CHO2
49.98
17.70
B
LiCHO2
Liquid
---
---
NH4CHO2
60.53
24.32
B
Notes:
a
The solid phases are: A = LiCHO
2
•H
2
O ; B = NH
4
CHO
2
.
Method/Apparatus/Procedure:
The isothermal method was used. Equilibrium was reached in 2 weeks. The lithium content of both phases was determined by flame photometry. The NH
4
+
content was determined by the tetraphenylborate method. The composition of the solid phases was determined by Schreinemakers' method, by TG analysis, IR spectroscopy and x-ray diffraction.
Source and Purity of Materials:
LiCHO
2
•H
2
O was prepared by neutralizing 85% formic acid with suprapure reagent grade LiOH. Ammonium formate was prepared by passing NH
3
into 90% formic acid.
Estimated Errors:
Temperature: The temperature was kept constant to within ± 0.1 °C.