SDS Volume
Volume 73. Metal and Ammonium Formate Systems, p None
Source Publication
Groschuff, E.; Ber. Dtsch. Chem. Ges. 36, 4351 (1903).
Conditions:
Temperature: 266.7 - 312.2 $\pu{K}$
Compiler:
Methodology:
The freezing point method was used to study the system.
Sample Information:
- $\ce{NH4CHO2.CH2O2}$ was prepared by the reaction of equimolar quantities of $\ce{NH4CHO2}$ and anhydrous formic acid. On cooling with ice to 283 K, small hexahedral plates separated out. No other information is given.
Measurement Errors:
Ambient temperature: Nothing is specified. The compiler estimates that the temperature was controlled to within ±0.5 K.
System Components:
- Ammonium formate, $\ce{ NH4CHO2 }$; [540-69-2] NIST WebBook
- Formic acid, $\ce{ CH2O2 }$; [64-18-6] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
| $T$ (°C) | 100w1 | 100w2 | 100w3 | $100 x_{1}$ | $100 x_{2}$ | $100 x_{3}$ | Phase (s) () b |
|---|---|---|---|---|---|---|---|
| -6.5 | 46.7 | 34.1 | 19.2 | 29.1a | 29.1a | 41.8a | A |
| 1.5 | 49.6 | 36.2 | 14.2 | 33.3a | 33.3a | 33.4a | A |
| 4 | 50.4 | 36.8 | 12.8 | 34.6a | 34.6a | 30.8a | A |
| 6 | 51.3 | 37.4 | 11.3 | 36.1a | 36.1a | 27.8a | A |
| 8.5 | 52.1 | 38.0 | 9.9 | 37.5a | 37.5a | 25a | A |
| -7 | 49.6 | 36.2 | 14.2 | 33.3a | 33.3a | 33.4a | B |
| 13 | 53.0 | 38.6 | 8.4 | 39.2a | 39.1a | 22a | C |
| 29 | 55.8 | 40.7 | 3.5 | 45.1a | 45.0a | 9.9a | C |
| 39 | 57.8 | 42.2 | 0 | 50.0a | 50.0a | 0a | C |
(a) These values were calculated by the compiler.
(a) The solid phases are: A = NH4CHO2 (stable); B = NH4CHO2 (unstable); C = NH4CHO2·HCHO2 (unstable); D = NH4CHO2·HCHO2 (stable).
(b) The solid phases are: A = NH4CHO2·CH2O2; B = NH4CHO2 (labile); C = NH4CHO2 (stable).
