SDS Volume
Volume 73. Metal and Ammonium Formate Systems, p None
Source Publication
Ahmatova, Zh. T.; Borina, A. F.; Lyashchenko, A. K.; Portnova, S. M.; Zh. Neorg. Khim. 31, 237-42 (1986).
Conditions:
Room Temp: Composition at 25 °C
Compilers:
St. Trendafilova, Chr. Balarew
Methodology:
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 $\ce{ZnSO4}$ at pH 5.5-6.0 using Xylenol Orange as indicator. The composition of the solid phases was determined by Schreinemakers' method.
Sample Information:
- The lithium formate was obtained by recrystallizing "pro analysis" $\ce{LiCHO2.H2O}$. Cobalt formate dihydrate was prepared by treating PA cobalt nitrate with $\ce{KOH}$ to ppt the hydroxide and then dissolving the hydroxide in a formic acid solution.
Measurement Errors:
Ambient temperature: No information is given.
Mass concentration (m/v) (1): No information is given.
System Components:
- Lithium formate, $\ce{ LiCHO2 }$; [556-63-8] NIST WebBook
- Cobalt formate, $\ce{ Co(CHO2)2 }$; [544-18-3] 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 |
|---|---|---|---|---|
| - | 2.42 | - | 0.166 | A |
| 2.47 | 1.44 | 0.495 | 0.101 | A |
| 6.14 | 0.53 | 1.27 | 0.038 | A |
| 8.83 | 0.37 | 1.87 | 0.027 | A |
| 13.10 | 0.28 | 2.911 | 0.022 | A |
| 16.99 | 0.23 | 3.950 | 0.018 | A |
| 20.21 | 0.22 | 4.888 | 0.018 | A |
| 22.16 | 0.22 | 5.495 | 0.019 | A |
| 22.98 | 0.23 | 5.760 | 0.020 | A |
| 24.78 | 0.37 | 6.372 | 0.033 | A + B |
| 25.00 | 0.41 | 6.451 | 0.037 | A + B |
| 26.80 | 0.22 | 7.068 | 0.020 | B |
| 27.47 | 0.20 | 7.310 | 0.018 | B |
| 27.56 | 0.27 | 7.350 | 0.025 | B |
| 28.02 | 0.15 | 7.508 | 0.014 | B |
| 27.85 | - | 7.429 | - | B |
(a) The solid phases are: A = Co(CHO2)2·2H2O ; B = LiCHO2·H2O.
(b) The molality values were calculated by the compilers.
