SDS Volume
Volume 66. Ammonium Phosphates, p None
Source Publication
Tukhtaev, S.; Kucharov, Kh.; Askarova, M. K.; Uzb. Khim. Zh. 1977, 32.
Conditions:
Temperature and composition.
Compilers:
Methodology:
A visual polythermic method and the isothermal method were used but details are not given.
Sample Information:
- Chemically pure $\ce{(NH4)2HPO4}$ was recrystallized twice. $\ce{Mg(ClO3)2}$ was recrystallized from ether. After the final recrystallization its purity was 99.1%.
Measurement Errors:
Ambient temperature: No information is given.
Mass concentration (m/v) (1): No information is given.
System Components:
- Diammonium hydrogenphosphate, $\ce{ (NH4)2HPO4 }$; [7783-28-0] NIST WebBook
- Ammonium chlorate, $\ce{ NH4ClO3 }$; [10192-29-7] NIST WebBook
- Magnesium hydrogenphosphate, $\ce{ MgHPO4 }$; [7757-86-0] NIST WebBook
- Magnesium chlorate, $\ce{ Mg(ClO3)2 }$; [10326-21-3] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
| $T$ (°C) | 100w1 | 100w2 | 100w3 | m1 (mol/kg) a | m2 (mol/kg) a | Phase (s) () b |
|---|---|---|---|---|---|---|
| -52.1 | 36.3 | 0.20 | 63.5 | 2.99 | 0.024 | A + B + C |
| -21.8 | 40.4 | 0.20 | 59.4 | 3.56 | 0.025 | B + C + D |
| -7.6 | 43.8 | 0.25 | 55.95 | 4.09 | 0.034 | C + D + E |
| -5.7 | 0.3 | 25.1 | 74.6 | 0.02 | 2.55 | A + C + F |
| -14.9 | 0.4 | 38.8 | 60.8 | 0.03 | 4.83 | C + F + G |
(a) The molalities were calculated by the compilers.
(b) The solid phases are: A = ice; B = Mg(ClO3)2·16H2O; C = Mg3(PO4)2·18H2O; D = Mg(ClO3)2·12H2O; E = Mg(ClO3)2·6H2O; F = (NH4)2HPO2·2H2O; G = (NH4)2HPO2.
