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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Lithium formate with Zinc formate and Water
Components:
(1) Lithium formate; LiCHO2; [556-63-8]
NIST Chemistry WebBook
for detail
(2) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
(3) Zinc formate; Zn(CHO2)2; [557-41-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Itkina, L.S.; Nadzharyan, K.A., Zh. Neorg. Khim. 24, 2283-5 (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
-Zn(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
---
---
Zn(CHO2)2
5.38
0.366
A
LiCHO2
Liquid
3.05
0.625
Zn(CHO2)2
3.01
0.206
A
LiCHO2
Liquid
6.23
1.31
Zn(CHO2)2
2.26
0.158
A
LiCHO2
Liquid
9.76
2.13
Zn(CHO2)2
1.90
0.138
A
LiCHO2
Liquid
15.17
3.520
Zn(CHO2)2
1.90
0.147
A
LiCHO2
Liquid
21.11
5.307
Zn(CHO2)2
2.33
0.196
A
LiCHO2
Liquid
26.63
7.276
Zn(CHO2)2
2.93
0.267
A
LiCHO2
Liquid
27.55
7.620
Zn(CHO2)2
2.86
0.264
A+B
LiCHO2
Liquid
26.50
7.115
Zn(CHO2)2
1.82
0.163
B
LiCHO2
Liquid
27.99
7.481
Zn(CHO2)2
---
---
B
Notes:
a
The solid phases are: A = Zn(CHO
2
)
2
•2H
2
O; B = LiCHO
2
•H
2
O.
Method/Apparatus/Procedure:
The isothermal method was used. Equilibrium was reached in 1-2 weeks. The lithium content of both phases was determined by flame photometry. The zinc content was determined complexometrically. The composition of the solid phases was determined by Schreinemakers' method.
Source and Purity of Materials:
LiCHO
2
•H
2
O was prepared by neutralizing 85% formic acid with suprapure reagent grade LiOH. The crystals were washed with alcohol and dried at 105 °C over H
2
SO
4
in a vacuum. Zn(CHO
2
)
2
•2H
2
O was prepared by the reaction of 85% p.a. grade formic acid with ZnO. It was recrystallized twice from 1% formic acid and dried at 105 °C.
Estimated Errors:
Temperature: The temperature was kept constant to within ±0.05 °C.