SDS Volume (2918)
Volume 66. Ammonium Phosphates, p None
Original Measurements
Torokhtey, L. P.; Ganz, S. N.; Braginskaya, R. I.; Izv. Vissh. Ucheb. Zaved.; Khim. Khim. Tekhnol. 15, 320 (1972).
Variables:
Temperature and composition.
Prepared by:
Method/Apparatus/Procedure:
A visual polythermic method [1] was used. Solid $\ce{CO2}$ was the cooling agent.
Source and Purity of Materials:
- Reagent grade $\ce{NH4NO3}$ and $\ce{(NH4)2HPO4}$ were recrystallized twice.
Estimated Errors:
Ambient temperature: The reproducibility is given as "minimal difference between the temperatures of appearance of the first crystal and the disappearance of the last crystal."
Mass concentration (m/v) (1): No information given.
References
1 Bergman, A. G.; Luzhnaya, N. P.; Fiziko-Khimicheskie Osnovy Izucheniya i Ispol'zovaniya Solyanykh Mestorozhdeniy Khlorid-Sul'fatnogo Tipa, Moscow, IAN USSR (1951).
Components:
- Diammonium hydrogenphosphate, $\ce{ (NH4)2HPO4 }$; [7783-28-0] NIST WebBook
- Ammonium nitrate, $\ce{ NH4NO3 }$; [6484-52-2] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
Nonvariant points in the NH4NO3-(NH4)2HPO2-H2O system
| $T$ (°C) | 100w1 | 100w2 | 100w3 | m1 (mol/kg) | m2 (mol/kg) | Phase (s) () |
|---|---|---|---|---|---|---|
| -17.5 | 35.5 | 6.5 | 58.0 | 7.65 | 0.849 | A + B + C |
| 3.7 | 65.0 | 4.0 | 31.0 | 26.2 | 0.977 | B + C + D |
| 28.6 | 53.0 | 5.0 | 42.0 | 15.8 | 0.901 | B + D + E |
(a) The molalities were calculated by the compiler.
(b) The solid phases are: A = ice; B = (NH4)2HPO2·2H2O; C = α-NH
