SDS Volume (4804)
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: 25 - 273 °C
Prepared by:
St. Trendafilova, St. Tepavitcharova
Method/Apparatus/Procedure:
The isothermal method was used at 28 and 30 °C. Equilibrium was reached within 4 weeks. The potassium and lithium content of both phases was determined by flame photometry [1]. The potassium content of the solid phase was also determined by the tetraphenylborate method in an acetic acid medium [2]. No experimental details are given for the other temperatures.
Source and Purity of Materials:
Estimated Errors:
Mass concentration (m/v) (1): 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).
3
Itkina, L. S.; Chaplygina, N. M.; Petrova, E. V.; Russ. J. Inorg. Chem. 24, 440-3 (1979).
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.
| $T$ (°C) | 100w1 | 100w2 | $100 x_{1}$ | $100 x_{2}$ | m1 (mol/kg) | m2 (mol/kg) | Phase (s) () |
|---|---|---|---|---|---|---|---|
| 25 | 24.86 | 44.43 | 17.65 | 19.48 | 15.58 | 17.20 | A + B |
| 25 | 9.84 | 61.23 | 7.51 | 28.85 | 6.55 | 25.16 | B + C |
| 25 | 27.12 | 48.12 | 21.14 | 23.17 | 21.08 | 23.10 | A |
| 25 | 24.42 | 49.63 | 18.80 | 23.60 | 18.11 | 22.74 | A |
| 25 | 24.94 | 49.64 | 19.35 | 23.79 | 18.88 | 23.21 | A |
| 25 | 23.28 | 49.83 | 17.69 | 23.39 | 16.66 | 22.03 | A |
| 28 | 23.74 | 48.28 | 17.68 | 22.21 | 16.33 | 20.51 | A |
| 30 | 25.84 | 49.68 | 20.33 | 24.17 | 20.32 | 24.13 | A + B + D |
| 50 | 36.31 | 46.23 | 31.51 | 24.78 | 40.02 | 31.48 | A + D |
| 50 | 87.80 | 71.49 | 6.9 | 39.53 | 7.25 | 41.04 | C + D |
| 100 | 39.61 | 43.04 | 34.08 | 22.87 | 43.94 | 29.49 | D + E |
| 100 | 12.96 | 78.94 | 15.24 | 57.32 | 30.79 | 115.9 | C + D |
| 118 | 60.51 | 39.49 | 71.27 | 28.73 | - | - | C + D |
| 140 | 25.01 | 74.99 | 35.06 | 64.94 | - | - | D + E |
| 160 | 7.46 | 2.54 | 38.02 | 62.07 | - | - | D |
| 167 | 0.0 | 100.0 | 0.0 | 100.0 | - | - | C |
| 273 | 100.0 | 0.0 | 100.0 | 0.0 | - | - | E |
(a) These values and the molality values were calculated by the compilers.
(b) The solid phases are: A = LiCHO2·H2O; B = LiCHO2·KCHO2·0.5H2O; C = KCHO2; D = LiCHO2·KCHO2; E = LiCHO2.
(c) Metastable condition; values taken from Ref.3.
(d) Metastable condition.
