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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:
D'Ans, J.; Schreiner, G., Z. Phys. Chem. 1911, 75, 95.
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]
(a)
Chemical
2
m
2
[mol/kg]
(a)
Chemical
3
10
2
* Mass Fraction w
3
(b)
m
3
[mol/kg]
(b)
Chemical
4
10
2
* Mass Fraction w
4
(b)
m
4
[mol/kg]
(b)
Chemical
5
10
2
* Mass Fraction w
5
(b)
Solid Phase(s)
(c)
NH3
7.42
H3PO4
0.084
NH3
12.6
8.57
H3PO4
0.82
0.097
H2O
86.5
A (d)
NH3
5.02
H3PO4
0.20
NH3
8.55
5.61
H3PO4
2.0
0.22
H2O
89.5
"
NH3
2.95
H3PO4
0.46
NH3
5.04
3.26
H3PO4
4.5
0.51
H2O
90.5
"
NH3
3.04
H3PO4
1.02
NH3
5.18
3.58
H3PO4
10.0
1.20
H2O
84.8
"
NH3
3.32
H3PO4
1.32
NH3
5.65
4.08
H3PO4
12.9
1.62
H2O
81.4
"
NH3
4.78
H3PO4
2.32
NH3
8.14
6.92
H3PO4
22.7
3.36
H2O
69.1
"
NH3
6.48
H3PO4
3.16
NH3
11.0
11.2
H3PO4
31.1
5.45
H2O
58.0
A + B
NH3
6.42
H3PO4
3.23
NH3
10.9
11.2
H3PO4
31.7
5.63
H2O
57.4
B
NH3
6.46
H3PO4
3.74
NH3
11.0
12.3
H3PO4
36.7
7.15
H2O
52.3
B
NH3
6.56
H3PO4
4.01
NH3
11.2
13.2
H3PO4
39.3
8.10
H2O
49.5
B
NH3
7.78
H3PO4
4.34
NH3
11.5
14.8
H3PO4
42.5
9.45
H2O
45.9
B
NH3
7.26
H3PO4
4.83
NH3
12.4
18.0
H3PO4
47.3
12.0
H2O
40.3
B
NH3
7.16
H3PO4
4.82
NH3
12.2
17.6
H3PO4
47.2
11.9
H2O
40.6
B
NH3
7.14
H3PO4
4.83
NH3
12.2
17.6
H3PO4
47.3
11.9
H2O
40.5
B + C
NH3
7.18
H3PO4
4.83
NH3
12.2
17.8
H3PO4
47.3
11.9
H2O
40.4
B + C
NH3
7.14
H3PO4
4.83
NH3
12.2
17.6
H3PO4
47.3
11.9
H2O
40.5
B + C
NH3
7.14 (e)
H3PO4
4.83 (e)
NH3
12.2
17.6
H3PO4
47.3
11.9
H2O
40.5
NH3
7.15 (e)
H3PO4
5.10 (e)
NH3
12.2
18.9
H3PO4
50.0
13.5
H2O
37.8
NH3
6.86 (e)
H3PO4
5.70(e)
NH3
11.7
21.1
H3PO4
55.9
17.6
H2O
32.5
NH3
6.70
H3PO4
6.74
NH3
11.4
29.7
H3PO4
66.1
29.9
H2O
22.5
C (d)
NH3
6.72
H3PO4
4.54
NH3
11.4
15.3
H3PO4
44.5
10.3
H2O
44.1
C
NH3
5.62
H3PO4
3.88
NH3
9.57
10.7
H3PO4
38.0
7.40
H2O
52.4
C
NH3
4.62
H3PO4
3.36
NH3
7.87
7.80
H3PO4
32.9
5.68
H2O
59.2
C (d)
NH3
2.72
H3PO4
2.59
NH3
4.63
3.89
H3PO4
25.4
3.70
H2O
70.0
C
NH3
2.50
H3PO4
2.54
NH3
4.26
3.53
H3PO4
24.9
3.59
H2O
70.9
C
NH3
2.58
H3PO4
4.29
NH3
4.39
4.82
H3PO4
42.0
8.01
H2O
53.6
C
NH3
2.76
H3PO4
6.21
NH3
4.70
8.01
H3PO4
60.9
18.0
H2O
34.4
C
NH3
3.06
H3PO4
7.70
NH3
5.21
15.8
H3PO4
75.5
39.8
H2O
19.3
C
NH3
3.10
H3PO4
7.86
NH3
5.28
17.5
H3PO4
77.0
44.4
H2O
17.7
C (d)
Notes:
Table 1
a
These compositions are expressed as mol/kg of solution.
Table 1
b
These values were calculated by the compiler.
Table 1
c
The solid phases are: A=(NH
4
)
3
PO
4
; B=(NH
4
)
2
HPO
4
; C=NH
4
H
2
PO
4
.
Table 1
d
These solid phases were analyzed.
Table 1
e
Metastable solutions.
Method/Apparatus/Procedure:
The isothermal method was used. H
3
PO
4
was precipitated as NH
4
MgPO
4
·6H
2
O and weighed as Mg
2
P
2
O
7
. Ammonia was distilled into an acid solution and determined volumetrically.
Source and Purity of Materials:
Commercial materials, pure.
Estimated Errors:
Solubility: The compiler assumes the reproducibility of the analyses to be about ± 0.5%.
Temperature: The temperature was controlled to within 0.05 k. No other details are given.