SDS Volume (2947)
Volume 66. Ammonium Phosphates, p None
Original Measurements
Berlin, L. E.; Mantsev, B. M.; Zh. Prikl. Khim. 1933, 6, 385.
Vol'fkovich, S. I.; Berlin, L. E.; Mantsev, B. M.; Tr. NIUIFa 1940, 228.
Variables:
Room Temp: Composition at 25 °C
Prepared by:
Method/Apparatus/Procedure:
The isothermal method was used. Equilibration requiredfour to five days. The composition of the solid phases was determined by the Schreinemakers method.
Source and Purity of Materials:
- No information is given.
Estimated Errors:
Ambient temperature: The temperature was kept constant within 0.05 K.
Components:
- Ammonia, $\ce{ NH3 }$; [7664-41-7] NIST WebBook
- Phosphoric acid, $\ce{ H3PO4 }$; [7664-38-2] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
Table I. Solubility in the NH4H2PO4-(NH4)2HPO4-H2O system at 25°C.
| 100w3 | 100w4 | 100w5 | g1/100 g H2O (g1/100 g2) | g2/100 g H2O (g1/100 g2) | m3 (mol/kg) | m4 (mol/kg) | Phase (s) () |
|---|---|---|---|---|---|---|---|
| 4.33 | 24.9 | 57.3 | 41.3 | 0.0 | 3.59 | 3.59 | A |
| 5.08 | 27.2 | 70.8 | 43.7 | 4.00 | 4.40 | 4.10 | A |
| 8.27 | 36.4 | 67.7 | 53.7 | 27.2 | 8.79 | 6.73 | A |
| 9.86 | 41.0 | 55.3 | 60.1 | 43.2 | 11.8 | 8.50 | A |
| 11.8 | 44.9 | 49.2 | 59.2 | 71.6 | 16.0 | 10.6 | A |
| 12.4 | 47.2 | 43.3 | 66.9 | 80.8 | 18.1 | 11.9 | A + B |
| 11.0 | 31.7 | 40.4 | 0.0 | 74.5 | 11.3 | 5.64 | B |
(a) These values were calculated by the compilers.
(b) The solid phases are: A = NH4H2PO4; B = (NH4)2HPO4; C = (NH4)3HPO4·3H2O.
(c) These data appear in source paper 2 only. The rest of the data are in both source papers.
