SDS Volume (2959)
Volume 66. Ammonium Phosphates, p None
Original Measurements
Kaganskiy, I. M.; Babenko, A. M.; Zh. Prikl. Khim. 1971, 44, 315.
Variables:
Temperature and composition
Prepared by:
Method/Apparatus/Procedure:
A modified polythermic method was used [1].
Source and Purity of Materials:
- Chemically pure or reagent grade salts were used. They were recrystallized twice. During the recrystallization special care was taken to obtain anhydrous $\ce{(NH4)2HPO4}$. The products were dried gently at 30°C to 50°C and analyzed for $\ce{NH3}$ and $\ce{P2O5}$ content.
Estimated Errors:
Ambient temperature: No information is given.
Mass concentration (m/v) (1): No information is given.
References
1 Erayzer, L. N.; Kaganskiy, I. M.; Zavod. Lab. 1967, 1, 119.
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
Part 1. Solubility isotherms in the NH4H2PO4-(NH4)2HPO4-H2O system.
| $T$ (°C) | w1 | 100w2 | 100w3 | 100w4 | 100w5 | m3 (mol/kg) | m4 (mol/kg) |
|---|---|---|---|---|---|---|---|
| 0 | 18.2 | 0.0 | 2.7 | 15.5 | 81.8 | 1.9 | 1.9 |
| 0 | 19.0 | 8.1 | 4.9 | 22.2 | 72.9 | 3.9 | 3.1 |
| 0 | 19.5 | 16.1 | 7.0 | 28.6 | 64.4 | 6.4 | 4.5 |
| 0 | 19.9 | 20.0 | 8.1 | 31.8 | 60.1 | 7.9 | 5.4 |
| 0 | 9.8 | 27.0 | 8.4 | 28.4 | 63.2 | 7.8 | 4.6 |
| 0 | 19.5 | 24.1 | 9.1 | 34.5 | 56.4 | 9.5 | 6.2 |
| 0 | 13.2 | 28.5 | 9.3 | 32.4 | 58.3 | 9.4 | 5.7 |
| 0 | 20.1 | 26.3 | 9.8 | 36.6 | 53.6 | 10.7 | 7.0 |
| 0 | 19.1 | 28.3 | 10.1 | 37.3 | 52.6 | 11.3 | 7.2 |
| 0 | 19.9 | 28.0 | 10.2 | 37.7 | 52.1 | 11.5 | 7.4 |
| 0 | 0.0 | 27.8 | 7.2 | 20.6 | 72.2 | 5.8 | 2.9 |
| 0 | 7.2 | 27.6 | 8.2 | 26.6 | 65.2 | 7.4 | 4.2 |
| 0 | 14.3 | 28.2 | 9.4 | 33.1 | 57.5 | 9.6 | 5.9 |
| 0 | 20.0 | 19.9 | 8.1 | 31.8 | 60.1 | 7.9 | 5.4 |
| 0 | 18.0 | 28.0 | 9.9 | 36.1 | 54.0 | 10.7 | 6.8 |
| 0 | 18.1 | 9.2 | 5.1 | 22.2 | 72.7 | 4.1 | 3.1 |
| -5 | 6.7 | 23.3 | 7.0 | 23.0 | 70.0 | 5.9 | 3.4 |
| -5 | 11.2 | 17.8 | 6.2 | 22.7 | 71.0 | 5.2 | 3.3 |
| -5 | 16.5 | 8.3 | 4.6 | 20.2 | 75.2 | 3.6 | 2.7 |
| -5 | 18.1 | 8.2 | 4.8 | 21.5 | 73.7 | 3.8 | 3.0 |
| -5 | 18.3 | 16.3 | 6.9 | 27.7 | 65.4 | 6.2 | 4.3 |
| -5 | 18.7 | 20.3 | 8.0 | 31.0 | 61.0 | 7.7 | 5.2 |
| -5 | 18.4 | 24.5 | 9.0 | 33.9 | 57.1 | 9.3 | 6.0 |
| -5 | 18.7 | 26.8 | 9.7 | 35.8 | 54.5 | 10.4 | 6.7 |
| -5 | 17.7 | 11.7 | 5.6 | 23.8 | 70.6 | 4.7 | 3.4 |
| -5 | 8.3 | 17.5 | 5.7 | 20.1 | 74.2 | 4.5 | 2.8 |
| -5 | 0.0 | 24.3 | 6.3 | 28.0 | 75.7 | 4.9 | 2.4 |
| -5 | 18.8 | 24.8 | 9.2 | 34.4 | 56.4 | 9.6 | 6.2 |
| -5 | 7.5 | 25.5 | 7.7 | 25.3 | 67.0 | 6.7 | 3.9 |
| -5 | 14.9 | 25.7 | 8.8 | 31.8 | 59.4 | 8.7 | 5.5 |
| -5 | 18.4 | 26.4 | 9.5 | 35.3 | 55.2 | 10.1 | 6.5 |
| -5 | 0.0 | 26.4 | 6.8 | 19.6 | 73.6 | 5.4 | 2.7 |
| 10 | 20.6 | 0.0 | 3.0 | 17.5 | 79.4 | 2.3 | 2.3 |
| 10 | 21.8 | 7.8 | 5.2 | 24.4 | 70.4 | 4.4 | 3.5 |
| 10 | 22.2 | 15.5 | 7.3 | 30.4 | 62.3 | 6.9 | 5.0 |
| 10 | 22.4 | 19.4 | 8.3 | 33.5 | 58.2 | 8.4 | 5.9 |
| 10 | 21.9 | 23.4 | 9.3 | 36.0 | 54.7 | 10.0 | 6.7 |
| 10 | 22.7 | 25.5 | 9.9 | 38.3 | 51.8 | 11.3 | 7.5 |
| 10 | 22.4 | 27.1 | 10.3 | 39.2 | 50.5 | 12.0 | 7.9 |
| 10 | 17.0 | 33.2 | 11.1 | 39.1 | 49.8 | 13.1 | 8.0 |
| 10 | 21.8 | 31.2 | 11.3 | 41.7 | 47.0 | 14.1 | 9.1 |
| 10 | 0.0 | 33.1 | 8.5 | 24.6 | 66.9 | 7.5 | 3.7 |
| 10 | 6.6 | 33.6 | 9.6 | 30.6 | 59.8 | 9.5 | 5.2 |
| 10 | 13.2 | 33.8 | 10.7 | 36.3 | 53.0 | 11.8 | 7.0 |
| 10 | 22.4 | 10.2 | 5.9 | 26.7 | 67.4 | 5.2 | 4.0 |
| 10 | 16.8 | 32.5 | 10.9 | 38.4 | 50.7 | 12.6 | 7.7 |
| 10 | 22.8 | 24.0 | 9.6 | 37.2 | 53.2 | 10.6 | 7.1 |
| 10 | 20.3 | 32.3 | 11.3 | 41.3 | 47.4 | 14.0 | 8.9 |
(a) These values were calculated by the compiler.
(b) Solid phases are: A = ice; B = NH4H2PO4; C = (NH4)2HPO4·2H2O; D = (NH4)2HPO4.
