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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Ammonium dihydrogenphosphate with Diammonium hydrogenphosphate and Water
Components:
(1) Ammonium dihydrogenphosphate; NH4H2PO4; [7722-76-1]
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:
Flatt, R.; Brunisholz, G.; Dagon, R., Helv. Chim. Acta 1961, 44, 2173.
Variables:
Concentration = Composition and temperature
Prepared By:
J. Eysseltová
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Composition of eutonic solutions in the NH
4
H
2
PO
4
-(NH
4
)
2
HPO
4
-H
2
O system.
t/°C
Chemical
1
Composition
1
[g/11 g H2O]
(a)
10
2
* Mass Fraction w
1
(b)
m
1
[mol/kg]
(b)
Chemical
2
Composition
2
[g/100 g H2O]
(a)
10
0
* Mass Fraction w
2
(b)
m
2
[mol/kg]
(b)
Chemical
3
10
2
* Mass Fraction w
3
(b)
0
NH4H2PO4
23.0
18.7
3.61
(NH4)2HPO4
57.1
36.3
6.11
H2O
45.0
25
NH4H2PO4
41.4
29.3
8.63
(NH4)2HPO4
70.2
41.2
10.57
H2O
29.5
50
NH4H2PO4
68.3
40.6
28.0
(NH4)2HPO4
87.8
46.8
28.1
H2O
12.6
The compiler recalculated the data in the Table above to give the following values
Chemical
1
10
2
* Mass Fraction w
1
m
1
[mol/kg]
Chemical
2
10
2
* Mass Fraction w
2
m
2
[mol/kg]
Chemical
3
10
2
* Mass Fraction w
3
(NH4)3PO4
35.4
5.28
H3PO4
19.6
4.44
H2O
45.0
(NH4)3PO4
43.7
9.93
H3PO4
26.8
9.28
H2O
29.5
(NH4)3PO4
52.8
28.1
H3PO4
34.6
28.0
H2O
12.6
Notes:
Table 1
a
The composition unit is g/100 g H
2
O.
Table 1
b
These values were calculated by the compiler.
Method/Apparatus/Procedure:
No information is given.
Source and Purity of Materials:
No information is given.
Estimated Errors:
Solubility: No information is given.
Temperature: No information is given.