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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Diammonium hydrogenphosphate with Ammonium nitrate and Water
Components:
(1) Ammonium nitrate; NH4NO3; [6484-52-2]
NIST Chemistry WebBook
for detail
(2) Diammonium hydrogenphosphate; (NH4)2HPO4; [7783-28-0]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Kuznetsov, D.I.; Kozhukhovskiy, A.A.; Borovaya, F.E., Zh. Prikl. Khim. (Leningrad) 21, 1278 (1948).
Variables:
Concentration = Composition and vapor pressure at 50 ºC.
Prepared By:
J. Eysseltová
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility and vapor pressure in the NH
4
NO
3
-(NH
4
)
2
HPO
4
-H
2
O system at 50 °C
Pressure [mm Hg]
Chemical
1
10
2
* Mass Fraction w
1
m
1
[mol/kg]
(a)
Chemical
2
10
2
* Mass Fraction w
2
m
2
[mol/kg]
(a)
Chemical
3
10
2
* Mass Fraction w
3
Comment(s)
44.4 [water]
NH4NO3
77.0
41.8
(NH4)2HPO4
---
---
H2O
23.0
0 P[ammonia](mm Hg)
42.9
NH4NO3
75.6
41.1
(NH4)2HPO4
1.4
0.5
H2O
23.0
1.4
48.0
NH4NO3
74.4
40.2
(NH4)2HPO4
2.5
0.8
H2O
23.1
1.3
50.0
NH4NO3
68.9
31.0
(NH4)2HPO4
3.3
0.9
H2O
27.8
1.4
66.4
NH4NO3
55.6
18.9
(NH4)2HPO4
7.6
1.6
H2O
36.8
1.3
72.0
NH4NO3
45.6
13.0
(NH4)2HPO4
10.7
1.9
H2O
43.7
2.3
71
NH4NO3
42.3
11.5
(NH4)2HPO4
11.8
1.9
H2O
45.9
2.9
77
NH4NO3
27.9
6.7
(NH4)2HPO4
20.3
3.0
H2O
51.8
4.3
75
NH4NO3
21.8
5.1
(NH4)2HPO4
25.3
3.6
H2O
52.9
2.0
78
NH4NO3
13.3
3.0
(NH4)2HPO4
32.2
4.5
H2O
54.5
3.4
82
NH4NO3
---
---
(NH4)2HPO4
47.05
6.73
H2O
52.95
5.3
Notes:
Table 1
a
The molalities were calculated by the compiler.
Method/Apparatus/Procedure:
An isothermal method
1
was used. The mixtures were prepared from finely powdered salts. The system was equilibrated for 3 days although 2 days proved to be sufficient. The phosphorus content of the saturated solutions was determined gravimetrically as NH
4
MgPO
4
. The ammonium content was determined by the distillation method and total nitrogen content was determined using Devarda's alloy. The vapor pressure was measured by the technique described elsewhere.
1
Source and Purity of Materials:
Reagent grade salts were recrystallized three times and dried at approximately 100 °C.
Estimated Errors:
Solubility: No information is given.
Temperature: No information is given.
References:
1
M. S. Vrevskiy, N. N. Zavaritskiy, and L. E. Sharlova, Zh. Russ. Fiz.-Khim. Obsh.
54
, 360 (1923).