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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Diammonium hydrogenphosphate with Water
Components:
(1) Diammonium hydrogenphosphate; (NH4)2HPO4; [7783-28-0]
NIST Chemistry WebBook
for detail
(2) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Jänecke, E., Z. Phys. Chem. 1936, 177, 7.
Variables:
Concentration = Composition and temperature.
Prepared By:
J. Eysseltová
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
The temperatures at which the last crystals disappeared in the (NH
4
)
2
HPO
4
-H
2
O system.
t/°C
Chemical
1
10
2
* Mass Fraction w
1
m
1
[mol/kg]
Chemical
2
10
2
* Mass Fraction w
2
Chemical
3
10
2
* Mass Fraction w
3
193, 191
NH3
21.4
37.3
H2O
16.9
(NH4)2HPO4 (a)
83.1
184, 180
NH3
21.1
34.4
H2O
19.4
(NH4)2HPO4 (a)
82.0
163, 159
NH3
18.8
20.5
H2O
25.2
(NH4)2HPO4 (a)
73.0
130, 122
NH3
16.7
14.0
H2O
34.1
(NH4)2HPO4 (a)
64.9
123, 117
NH3
16.0
12.4
H2O
37.0
(NH4)2HPO4 (a)
62.2
Notes:
Table 1
a
These values were calculated by the compiler. The NH
3
content was taken as the starting point in these calculations.
Table 1
b
These are the results of repeated observations.
Method/Apparatus/Procedure:
The only information given is that a self-constructed rotating furnace was used.
Source and Purity of Materials:
No information is given.
Estimated Errors:
Temperature: No information is given. The compiler estimates the reproducibility of the temperature measurement to be ±3 °C.