Components:
(1) Ammonium formate,
NH4CHO2; [540-69-2]
NIST WebBook
(2) Water,
H2O; [7732-18-5]
NIST WebBook
Original Measurements
Groschuff, E.; Ber. Dtsch. Chem. Ges. 36, 1783-95 (1903).
Variables:
Ambient temperature: -1 - 116 °C
Prepared by:
St. Trendafilova, Chr. Balarew
Method/Apparatus/Procedure:
The precise quantities of solute and solvent are weighed and mixed. After the solute has completely dissolved the mixture is cooled until a small quantity of precipitate is formed. The temperature at which the solid disappears is measured.
Source and Purity of Materials:
- No information is given.
Estimated Errors:
Mass concentration (m/v) (1): There is some error due to loss of ammonia vapor, but this was not evaluated quantitatively.
Experimental Values:
Composition of equilibrium liquid phase.
| T (°C) | 100w1 | m1 (mol/kg)a | Phase (s) |
|---|---|---|---|
| -1.0 | 50.0 | 15.9 | NH4CHO2 |
| 12.5 | 55.6 | 19.9 | NH4CHO2 |
| 20.0 | 58.9 | 22.7 | NH4CHO2 |
| 29.0 | 62.5 | 26.4 | NH4CHO2 |
| 39.0 | 66.7 | 31.8 | NH4CHO2 |
| 63.5 | 76.9 | 52.8 | NH4CHO2 |
| 116.0 | 100.0 | - | (m.p.) |
(a) These values were calculated by the compilers. (b) Melting point.
