SDS Volume (4810)
Volume 73. Metal and Ammonium Formate Systems, p None
Original Measurements
Itkina, L. S.; Petrova, E. V.; Russ. J. Inorg. Chem. 27, 294-6 (1982).
Variables:
Room Temp: Composition at 25 °C
Prepared by:
St. Trendafilova, Chr. Balarew
Method/Apparatus/Procedure:
The isothermal method was used. Two weeks were allowed for equilibration. The potassium content was determined by flame photometry. Formate ion content was determined permanganometrically. Sodium ion content was determined by the difference. The composition of the solid phases was determined by Schreinemakers' method.
Source and Purity of Materials:
- The sodium and potassium formates were prepared by neutralizing formic acid with the corresponding pro analysis grade hydroxides.
Estimated Errors:
Ambient temperature: No information is given.
Mass concentration (m/v) (1): No information is given.
Components:
- Sodium formate, $\ce{ NaCHO2 }$; [141-53-7] 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 NaCHO2-KCHO2-H2O system at 25°C.
| 100w1 | 100w2 | m1 (mol/kg) | m2 (mol/kg) | Phase (s) () |
|---|---|---|---|---|
| 50.97 | - | 15.28 | - | A |
| 49.10 | 2.62 | 14.95 | 0.645 | A |
| 27.12 | 29.15 | 9.117 | 7.926 | A |
| 21.80 | 53.03 | 12.73 | 25.05 | A |
| 23.51 | 56.95 | 17.69 | 34.66 | A + B |
| 22.98 | 55.18 | 15.47 | 30.04 | B |
| 19.94 | 57.31 | 12.89 | 29.95 | B |
| 14.48 | 61.40 | 8.826 | 30.27 | B |
| 12.86 | 62.43 | 7.651 | 30.04 | B |
| 10.33 | 67.42 | 6.825 | 36.03 | B |
| 5.84 | 74.41 | 4.35 | 44.80 | B + C |
| 2.95 | 72.91 | 1.80 | 35.91 | C |
| 3.32 | 73.94 | 2.15 | 38.66 | C |
| - | 81.82 | - | 53.51 | C |
(a) The molality values were calculated by the compilers.
(b) The solid phases are: A = NaCHO2; B = NaCHO2ยท2.5KCHO2; C = KCHO2.
