SDS Volume (4802)
Volume 73. Metal and Ammonium Formate Systems, p None
Original Measurements
Itkina, L. S.; Chaplygina, N. M.; Petrova, E. V.; Russ. J. Inorg. Chem. 24, 440-3 (1979).
Variables:
Room Temp: Composition at 25 °C
Prepared by:
St. Trendafilova, Chr. Balarew
Method/Apparatus/Procedure:
The isothermal method was used. Three weeks, with stirring, were allowed for equilibration. The lithium content of both phases was determined by flame photometry. The potassium content was determined by flame photometry and by the tetraphenyl-borate method. The composition of the solid phases was determined by Schreinemakers' method.
Source and Purity of Materials:
- The lithium and potassium formates were prepared by neutralizing 85% formic acid with the corresponding pro analysis grade hydroxides. After evaporation, the salts were washed with ethanol and dried over $\ce{H2SO4}$. The products were $\ce{LiCHO2.H2O}$ and $\ce{KCHO2}$. Anhydrous $\ce{LiCHO2}$ was obtained by drying the hydrate at 100-110°C in a $\ce{N2}$ atmosphere.
Estimated Errors:
Ambient temperature: No information is given.
Mass concentration (m/v) (1): No information is given.
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 25°C.
| 100w1 | 100w2 | m1 (mol/kg) | m2 (mol/kg) | Phase (s) () |
|---|---|---|---|---|
| 27.85 | - | 7.429 | - | A |
| 26.30 | 3.27 | 7.187 | 0.552 | A |
| 25.53 | 10.56 | 7.688 | 1.964 | A |
| 22.54 | 26.66 | 7.775 | 4.615 | A |
| 21.41 | 29.39 | 8.375 | 7.101 | A |
| 22.01 | 35.71 | 10.02 | 10.04 | A |
| 24.71 | 36.06 | 12.12 | 10.93 | A |
| 25.61 | 38.29 | 13.65 | 12.61 | A |
| 23.88 | 40.10 | 12.76 | 13.23 | A |
| 24.33 | 42.55 | 14.14 | 15.27 | A |
| 27.03 | 48.23 | 21.03 | 23.18 | A |
| 24.63 | 49.42 | 18.27 | 22.64 | A |
| 24.78 | 49.82 | 18.78 | 23.32 | A |
| 24.93 | 44.28 | 15.58 | 17.10 | A + B |
| 23.66 | 46.99 | 15.52 | 19.03 | B |
| 17.44 | 50.49 | 10.47 | 18.72 | B |
| 15.57 | 54.04 | 9.861 | 21.14 | B |
| 15.35 | 53.29 | 9.421 | 20.20 | B |
| 11.83 | 59.64 | 7.981 | 24.85 | B |
| 10.48 | 62.76 | 7.538 | 27.88 | B |
| 9.88 | 61.18 | 6.57 | 25.13 | B + C |
| 8.54 | 72.61 | 8.72 | 45.79 | C |
| 1.57 | 83.80 | 2.07 | 68.09 | C |
| - | 81.82 | - | 53.50 | C |
(a) The solid phases are: A = LiCHO2·H2O ; B = LiCHO2·KCHO2·0.5H2O; C = KCHO2.
(b) The molality values were calculated by the compilers.
