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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:
Torokhtey, L.P.; Ganz, S.N.; Braginskaya, R.I., Izv. Vissh. Ucheb. Zaved., Khim. Khim. Tekhnol. 15, 320 (1972).
Variables:
Concentration = Temperature and composition.
Prepared By:
J. Eysseltová
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Nonvariant points in the NH
4
NO
3
-(NH
4
)
2
HPO
2
-H
2
O system
t/°C
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
Solid Phase(s)
(b)
-17.5
NH4NO3
35.5
7.65
(NH4)2HPO4
6.5
0.849
H2O
58.0
A + B + C
3.7
NH4NO3
65.0
26.2
(NH4)2HPO4
4.0
0.977
H2O
31.0
B + C + D
28.6
NH4NO3
53.0
15.8
(NH4)2HPO4
5.0
0.901
H2O
42.0
B + D + E
Notes:
Table 1
a
The molalities were calculated by the compiler.
Table 1
b
The solid phases are: A=ice; B=(NH
4
)
2
HPO
2
·2H
2
O; C=α-NH
NO
3
; D=(NH
4
)
2
HPO
2
; E=β-NH
4
NO
3
.
Method/Apparatus/Procedure:
A visual polythermic method
1
was used. Solid CO
2
was the cooling agent.
Source and Purity of Materials:
Reagent grade NH
4
NO
3
and (NH
4
)
2
HPO
4
were recrystallized twice.
Estimated Errors:
Solubility: No information given.
Temperature: The reproducibility is given as "minimal difference between the temperatures of appearance of the first crystal and the disappearance of the last crystal."
References:
1
A. G. Bergman and N. P. Luzhnaya, Fiziko-khimicheskiye Osnovy Izucheniya i Ispol'zovaiya Solyanyh Mestorozhdeniy Khlorid-sul'fatnogo Tipa, Moscow, IAN SSSR (1951).