SDS Volume (4717)
Volume 73. Metal and Ammonium Formate Systems, p None
Original Measurements
Sas, T. M.; Rodina,G. L.; Velikodnyn, Yu. A.; Tr. IREA Moscow Ser. Reagents and specially pure substances 42, 168 (1980).
Variables:
Temperature: 298.2 and 323.2 $\pu{K}$
Prepared by:
Method/Apparatus/Procedure:
The isothermal method was used [1]. The formic acid content was determined by titration with $\pu{0.1 N} \ce{NaOH}$ using phenolphthalein as indicator. The $\ce{KCHO2}$ content was determined by titration with $\ce{NaOH}$ after passing the weighed sample through a chromatographic column. The water content was calculated by difference. The solid phase was identified by chemical, thermogravimetric, gas chromatographic and X-ray methods.
Source and Purity of Materials:
- Temperature: No information is given.
Estimated Errors:
Ambient temperature: No information is given.
Mass concentration (m/v) (1): ±0.5 mass%. Nothing else is specified.
References
1 Othmer, D. F.; Tobias, P. E.; Ind. Eng. Chem. 34, 690 (1942).
Components:
- Potassium formate, $\ce{ KCHO2 }$; [590-29-4] NIST WebBook
- Formic acid, $\ce{ CH2O2 }$; [64-18-6] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
Note: The data for 323.2 K are given only in graphical form.
Solubility in the KCHO2-CH2O2-H2O system at 298.2 K.
| 100w1 | 100w2 | 100w3 | $100 x_{1}$ | $100 x_{2}$ | $100 x_{3}$ | Phase (s) () |
|---|---|---|---|---|---|---|
| 27.9 | 72.0 | 0.1 | 17.4 | 82.3 | 0.3 | A |
| 40.5 | 56.7 | 2.8 | 25.8 | 65.9 | 8.3 | A |
| 40.5 | 43.4 | 16.1 | 20.8 | 43.7 | 38.6 | A |
| 37.6 | 40.8 | 21.6 | 17.7 | 35.0 | 47.3 | A |
| 34.6 | 34.0 | 31.4 | 14.2 | 25.5 | 60.2 | A |
| 44.8 | 27.2 | 28.0 | 19.9 | 22.1 | 58.0 | A |
| 45.4 | 24.6 | 30.0 | 19.7 | 19.5 | 60.8 | A |
| 56.5 | 13.85 | 29.65 | 25.7 | 11.5 | 62.9 | B |
| 60.7 | 10.3 | 29.0 | 28.2 | 8.76 | 63.0 | B |
| 76.2 | 3.85 | 19.95 | 43.2 | 3.99 | 52.8 | C |
| 78.4 | 0.0 | 21.6 | 43.7 | 0.0 | 56.3 | C |
(a) These values were calculated by the compiler.
(b) The solid phases are: A = KCHO2·CH2O2; B = KCHO2·CH2O2·0.5H2O; C = KCHO2.
