SDS Volume (2910)
Volume 66. Ammonium Phosphates, p None
Original Measurements
Zakirov, B. S.; Tukhtaev, S.; Beglov, B. M.; Khaymov, B. M.; Dokl. Akad. Nauk Uzb. SSR, 31 (1977).
Variables:
Room Temp: Composition at 25 °C
Prepared by:
Method/Apparatus/Procedure:
The isothermal method was used with mechanical stirring. Equilibrium was determined by repeated analysis of the liquid phase. Equilibrium was attained in 24 hrs. The composition of the solid phases was determined by the Schreinemakers' method.
Source and Purity of Materials:
- Nothing is stated. The compiler assumes the materials are the same as those used in [1].
Estimated Errors:
Ambient temperature: The only information given is that the temperature was controlled to within ±0.2 K.
Mass concentration (m/v) (1): No information given.
References
1 Zakirov, B. S.; Tukhtaev, S.; Beglov, B. M.; Khaymov, B. M.; Dokl. Akad. Nauk Uzb. SSR, 48 (1978).
Components:
- Diammonium hydrogenphosphate, $\ce{ (NH4)2HPO4 }$; [7783-28-0] NIST WebBook
- Thiourea, $\ce{ CH4N2S }$; [62-56-6] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
Solubility in the (NH4)2HPO4-CS(NH2)2-H2O system at 25°C
| 100w1 | 100w3 | m1 (mol/kg) | Phase (s) () | ||
|---|---|---|---|---|---|
| 14.23 | 85.77 | 2.180 | CS(NH2)2 | ||
| 13.19 | 6.44 | 80.37 | 2.156 | 0.607 | CS(NH2)2 |
| 11.76 | 11.64 | 76.60 | 2.017 | 1.151 | CS(NH2)2 |
| 9.58 | 20.71 | 69.71 | 1.80 | 2.249 | CS(NH2)2 |
| 8.16 | 25.49 | 66.35 | 1.62 | 2.909 | CS(NH2)2 |
| 6.74 | 29.65 | 63.61 | 1.39 | 3.529 | CS(NH2)2 |
| 5.19 | 35.46 | 59.35 | 1.15 | 4.524 | CS(NH2)2 |
| 4.24 | 38.81 | 56.95 | 0.978 | 5.160 | CS(NH2)2 + (NH4)2HPO4 |
| 1.98 | 40.07 | 57.95 | 0.449 | 5.236 | (NH4)2HPO4 |
| 41.4 | 58.6 | 5.35 | (NH4)2HPO4 |
(a) The molalities were calculated by the compiler.
