SDS Volume
Volume 66. Ammonium Phosphates, p None
Source Publication
Vereshchagina, V. I.; Endovitskaya, M. P.; Zh. Neorg. Khim. 15, 2818 (1970).
Conditions:
Temperature and composition.
Compiler:
Methodology:
A visual polythermic method was used [1]. Solid carbon dioxide was sued as the cooling agent. The temperature was measured with the aid of Assman's thermometer, the scale of which was divided in steps of 0.2 K.
Sample Information:
- No information is given
Measurement Errors:
Ambient temperature: The temperature was constant to within ±0.40°C.
Methodology Citation
1 Bergman, A. G.; Luzhnaya, N. P.; Fiziko-Khimicheskie Osnovy Izucheniya i Ispol'zovaniya Solyanykh Mestorozhdeniy Khlorid-Sul'fatnogo Tipa, Moscow, IAN USSR (1951).
System Components:
- Diammonium hydrogenphosphate, $\ce{ (NH4)2HPO4 }$; [7783-28-0] NIST WebBook
- Urea, $\ce{ CH4N2O }$; [57-13-6] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
| $T$ (°C) | 100w1 | m1 (mol/kg) a | Phase (s) () |
|---|---|---|---|
| -5.5 | 28.0 | 2.94 | Ice + (NH4)2HPO4·2H2O |
| 15.2 | 39.5 | 4.94 | (NH4)2HPO4·2H2O + (NH4)2HPO4 |
(a) These values were calculated by the compilers.
(a) These values were calculated by the compiler.
(b) The solid phases are: A = β-urea; B = γ-urea. C = (NH4)2HPO4; D = (NH4)2HPO4·2H2O; E = α-urea.
