Components:
(1) Diammonium hydrogenphosphate,
(NH4)2HPO4; [7783-28-0]
NIST WebBook
(2) Ammonium sulfate,
(NH4)2SO4; [7783-20-2]
NIST WebBook
(3) Water,
H2O; [7732-18-5]
NIST WebBook
Original Measurements
Vol'fkovich, S. I.; Berlin, L. E.; Mantsev, B. M.; Tr. NIUIFa 1940, 228.
Variables:
Ambient temperature: Composition at 25 °C.
Prepared by:
Method/Apparatus/Procedure:
The isothermal method was used. Equilibration required 4 to 5 days. The composition of the solid phases was determined by the Schreinemakers method. More experimental details have been described previously.1
Source and Purity of Materials:
- No information is given.
Estimated Errors:
Ambient temperature: The temperature was kept constant within ±0.05 K. No other information is given.
Mass concentration (m/v) (1): No information given.
References
1 Berlin, L. E.; Mantsev, B. M.; Zh. Prikl. Khim. 1933, 6, 385.
Experimental Values:
Solubility in the (NH4)2HPO2-(NH4)2SO4-H2O system at 25°C
| 100w1 | w2 | 100w3 | g1/100 g H2O (g1/100 g2) | g2/100 g H2O (g1/100 g2) | m1 (mol/kg)b | m2 (mol/kg)b | Phase (s)c |
|---|---|---|---|---|---|---|---|
| 42.7 | 0.0 | 57.3 | 74.5 | 0.0 | 5.64 | 0.0 | A |
| 35.5 | 19.8 | 44.7 | 55.0 | 24.7 | 6.01 | 3.35 | A |
| 29.9 | 33.1 | 37.0 | 42.7 | 49.5 | 6.12 | 6.77 | A |
| 26.8 | 40.4 | 32.8 | 36.6 | 67.7 | 6.19 | 9.32 | A + B |
| 0.0 | 43.3 | 56.7 | 0.0 | 76.4 | 0.0 | 5.78 | B |
(a) The composition units are: g/100g H2O. (b) These values were calculated by the compilers. (c) The solid phases are: A = (NH4)2HPO2; B = (NH4)2SO4.
