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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Ammonia with Phosphoric acid and Water
Components:
(1) Ammonia; NH3; [7664-41-7]
NIST Chemistry WebBook
for detail
(2) Phosphoric acid; H3PO4; [7664-38-2]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Parker, E.G., J. Phys. Chem. 1914, 18, 653.
Variables:
Concentration = Composition at 25 ºC.
Prepared By:
J. Eysseltová
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility in the (NH
4
)
3
PO
4
-NH
3
-H
3
PO
4
-H
2
O system at 25 °C.
Chemical
1
m
1
[mol/kg]
(b)
Chemical
2
m
2
[mol/kg]
(b)
Chemical
3
10
2
* Mass Fraction w
3
(a)
m
3
[mol/kg]
(a)
Chemical
4
10
2
* Mass Fraction w
4
(a)
m
4
[mol/kg]
(a)
Chemical
5
10
2
* Mass Fraction w
5
(a)
Solid Phase(s)
(c)
NH3
2.77
H3PO4
6.09
NH3
4.72
8.22
H3PO4
61.57
18.63
H2O
33.72
A
NH3
2.75
H3PO4
5.44
NH3
4.68
6.82
H3PO4
55.00
13.92
H2O
40.32
A
NH3
2.50
H3PO4
4.61
NH3
4.26
5.09
H3PO4
46.60
9.68
H2O
49.14
A
NH3
2.40
H3PO4
3.62
NH3
4.09
4.05
H3PO4
36.60
6.30
H2O
59.32
A
NH3
2.45
H3PO4
2.64
NH3
4.17
3.54
H3PO4
26.69
3.94
H2O
69.14
A
NH3
2.58
H3PO4
2.57
NH3
4.39
3.71
H3PO4
25.98
3.81
H2O
69.62
A
NH3
2.58
H3PO4
2.67
NH3
4.39
3.76
H3PO4
26.99
4.01
H2O
68.61
A
NH3
4.04
H3PO4
3.30
NH3
6.88
6.76
H3PO4
33.36
5.70
H2O
59.76
A
NH3
5.23
H3PO4
3.77
NH3
8.91
9.87
H3PO4
38.11
7.34
H2O
52.98
A
NH3
7.21
H3PO4
4.75
NH3
12.28
18.16
H3PO4
48.02
12.34
H2O
39.70
A
NH3
7.30
H3PO4
4.76
NH3
12.43
18.51
H3PO4
48.12
12.45
H2O
39.45
B
NH3
7.01
H3PO4
4.38
NH3
11.94
16.01
H3PO4
44.28
10.32
H2O
43.78
B
NH3
6.90
H3PO4
3.95
NH3
11.75
14.28
H3PO4
39.93
8.43
H2O
48.32
B
NH3
6.27
H3PO4
3.41
NH3
10.68
11.43
H3PO4
34.47
6.41
H2O
54.85
C
NH3
4.28
H3PO4
2.57
NH3
7.29
6.41
H3PO4
25.98
3.97
H2O
66.73
C
NH3
4.19
H3PO4
1.83
NH3
7.14
5.63
H3PO4
18.50
2.54
H2O
74.36
C
NH3
6.59
H3PO4
1.33
NH3
11.22
8.75
H3PO4
13.45
1.82
H2O
75.33
C
NH3
8.75
H3PO4
0.87
NH3
14.90
11.47
H3PO4
8.80
1.18
H2O
76.30
C
NH3
11.48
H3PO4
0.43
NH3
19.55
15.08
H3PO4
4.35
0.58
H2O
76.10
C
NH3
14.08
H3PO4
0.41
NH3
23.98
19.59
H3PO4
4.14
0.59
H2O
71.88
C
Notes:
Table 1
a
All these values were calculated by the compiler
Table 1
b
The compositions unit is: mol/1000 g of the solution.
Table 1
c
The solid phases are: A=NH
4
H
2
PO
4
·H
2
O; B= (NH
4
)
2
HPO
4
; C=(NH
4
)
3
PO
4
.
Method/Apparatus/Procedure:
Bottles containing mixtures of ammonia and orthophosphoric acid and in contact with a solid phase were allowed to rotate in a thermostat until equilibrium was established. Ammonia and phosphorus were determined by methods described elsewhere.
1
Source and Purity of Materials:
No information is given.
Estimated Errors:
References:
1
F. P. Treadwell and W. T. Hall, Analytical Chemistry, Vol II,
59
, 434 (1913).