SDS Volume (4805)
Volume 73. Metal and Ammonium Formate Systems, p None
Original Measurements
Portnova, S. M.; Petrova, E. V.; Russ. J. Inorg. Chem. 30, 1045-8 (1985).
Variables:
Room Temp: Composition at 50 °C
Prepared by:
St. Trendafilova, Chr. Balarew
Method/Apparatus/Procedure:
The isothermal method was used. Two weeks were allowed for equilibration. The potassium and lithium content of both phases was determined by flame photometry using a Carl Zeiss photometer [1]. The potassium content of the solid phase was also determined by the tetraphenylborate method in an acetic acid medium [2].
Source and Purity of Materials:
Estimated Errors:
Mass concentration (m/v) (1): The analytical error is ±5%.
References
1
Poluektov, N. S.; Methods of Analysis by Flame Photometry (Russ), 2nd ed. (Khimiya, Moscow, 1967), p. 308.
2
Rusakova, G. G.; Zh. Anal. Khim. 18, 154 (1963).
Components:
- Lithium formate, $\ce{ LiCHO2 }$; [556-63-8] NIST WebBook
- Potassium formate, $\ce{ KCHO2 }$; [590-29-4] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
Solubility values in the LiCHO2-KCHO2-H2O system at 50°C.
| 100w1 | 100w2 | m1 (mol/kg) | m2 (mol/kg) | Phase (s) () |
|---|---|---|---|---|
| 36.04 | - | 10.84 | - | A |
| 34.44 | 20.12 | 14.59 | 5.26 | A |
| 32.49 | 35.28 | 19.40 | 13.01 | A |
| 34.37 | 36.17 | 22.45 | 14.60 | A |
| 34.81 | 43.11 | 30.34 | 23.21 | A |
| 36.46 | 44.60 | 37.05 | 27.99 | A |
| 36.16 | 46.28 | 39.63 | 31.33 | A + B |
| 33.99 | 46.47 | 33.48 | 28.27 | B |
| 28.15 | 54.97 | 32.10 | 38.71 | B |
| 19.92 | 64.48 | 24.58 | 49.14 | B |
| 12.20 | 68.91 | 12.43 | 43.37 | B |
| 7.64 | 71.62 | 7.09 | 41.05 | B + C |
| 6.32 | 76.83 | 4.22 | 54.21 | C |
| 4.76 | 81.13 | 6.49 | 68.35 | C |
| - | 84.69 | - | 65.76 | C |
(a) The solid phases are: A = LiCHO2·H2O; B = LiCHO2·KCHO2; C = KCHO2.
(b) The molality values were calculated by the compilers.
