SDS Volume
Volume 73. Metal and Ammonium Formate Systems, p None
Source Publication
Itkina, L. S.; Nadzharyan, K. A.; Zh. Neorg. Khim. 24, 2283-5 (1979).
Conditions:
Room Temp: Composition at 50 °C
Compilers:
St. Trendafilova, Chr. Balarew
Methodology:
The isothermal method was used. The mixtures were placed in glass vessels in a thermostat and stirred mechanically. 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.
Sample Information:
- $\ce{LiCHO2.H2O}$ was prepared by neutralizing 85% formic acid with suprapure reagent grade $\ce{LiOH}$. The crystals were washed with alcohol and dried at 105°C over $\ce{H2SO4}$ in a vacuum. $\ce{Zn(CHO2)2.2H2O}$ was prepared by the reaction of 85% PA grade formic acid with $\ce{ZnO}$. It was recrystallized twice from 1% formic acid and dried at 105°C.
Measurement Errors:
Ambient temperature: The temperature was kept constant to within ±0.5°C
System Components:
- Lithium formate, $\ce{ LiCHO2 }$; [556-63-8] NIST WebBook
- Zinc formate, $\ce{ Zn(CHO2)2 }$; [557-41-5] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
| 100w1 | 100w2 | m1 (mol/kg) b | m2 (mol/kg) b | Phase (s) () a |
|---|---|---|---|---|
| - | 8.38 | - | 0.588 | A |
| 11.0 | 5.06 | 2.52 | 0.388 | A |
| 20.95 | 6.95 | 5.592 | 0.620 | A |
| 25.15 | 8.78 | 7.326 | 0.855 | A |
| 29.45 | 10.14 | 9.383 | 1.080 | A |
| 33.16 | 9.30 | 11.09 | 1.04 | A + B |
| 32.40 | 8.49 | 10.55 | 0.924 | B |
| 33.35 | 4.16 | 10.27 | 0.428 | B |
| 36.04 | - | 10.845 | - | B |
(a) The solid phases are: A = Zn(CHO2)2·2H2O; B = LiCHO2·H2O.
(b) The molality values were calculated by the compilers.
