SDS Volume
Volume 66. Ammonium Phosphates, p None
Source Publication
Uno, S.; Kogyo Kagaku Zashi 1940, 43, 399-402.
Uno, S.; J. Soc. Chim. Ind., Japan, Suppl. Binding 1940, 43, 168B-170B.
Conditions:
Room Temp: Composition at 25 and 70 °C
Compilers:
Methodology:
The isothermal method was used. Ammonium dihydrogenphosphate, phosphoric acid and water were placed in ampules. The mixtures were shaken in a thermostat at 25 °C and 70 °C. After equilibrium was established, the mixtures were allowed to settle. A pipet was used in sampling aliquots of the saturated solution for analysis.
Sample Information:
- Chemically pure reagents were used. Ammonium dihydrogenphosphate was recrystallized.
Measurement Errors:
Ambient temperature: precision ±0.05 K at 298 K and ±0.5 K at 343 K.
Mass concentration (m/v) (1): nothing specified.
System 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
| $T$ (°C) | 100w3 | 100w4 | 100w5 | g1/100 g H2O (g1/100 g2) | g2/100 g H2O (g1/100 g2) | m3 (mol/kg) | m4 (mol/kg) |
|---|---|---|---|---|---|---|---|
| 25 | 4.28b | 24.6b | 71.1b | 40.7 | 0 | 3.54 | 3.54 |
| 25 | 4.46 | 37.5 | 58.0 | 51.9 | 20.5 | 4.51 | 6.60 |
| 25 | 4.58 | 49.0 | 46.4 | 66.6 | 48.9 | 5.79 | 10.8 |
| 25 | 4.65 | 59.4 | 36.0 | 87.3 | 90.6 | 7.59 | 16.8 |
| 25 | 4.706 | 64.19 | 31.10 | 102.2 | 119.3 | 8.884 | 21.06 |
| 25 | 4.837 | 70.16 | 25.00 | 130.7 | 169.3 | 11.36 | 28.64 |
| 25 | 5.238 | 79.96 | 14.80 | 239.0 | 336.5 | 20.78 | 55.11 |
| 70 | 7.428 | 42.74 | 49.83 | 100.7 | 0 | 8.753 | 8.753 |
| 70 | 7.119 | 47.38 | 45.50 | 105.7 | 14.10 | 9.188 | 10.63 |
| 70 | 6.988 | 50.36 | 42.64 | 110.7 | 23.80 | 9.623 | 12.05 |
| 70 | 6.768 | 59.64 | 33.59 | 136.1 | 61.60 | 11.83 | 18.12 |
| 70 | 6.577 | 65.14 | 28.28 | 157.1 | 96.50 | 13.66 | 23.50 |
| 70 | 6.649 | 75.37 | 17.97 | 249.9 | 206.5 | 21.72 | 42.79 |
(a) The source of the solid phase was not repeated.
(b) These values were calculated by the compilers.
