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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:
Flatt, R.; Brunisholz, G.; Dagon, R., Helv. Chim. Acta 1961, 44, 2173.
Variables:
Concentration = Composition at 0 ºC and 50 ºC
Prepared By:
J. Eysseltová
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Part 1. Composition of saturated solutions of the NH
4
+
-H
+
-PO
4
3—
H
2
O system.
t/°C
Chemical
1
Mass Fraction w
1
ion %
Chemical
2
Mass Fraction w
2
ion %
Chemical
3
Mole Fraction
3
(a)
Chemical
4
10
2
* Mass Fraction w
4
m
4
[mol/kg]
Chemical
5
10
2
* Mass Fraction w
5
m
5
[mol/kg]
Chemical
6
10
2
* Mass Fraction w
6
(b)
Solid Phase(s)
(c)
0
NH4+
100.0
H+
0.0
H2O
3900
NH3 (b)
2.26
1.42
H3PO4 (b)
4.34
0.47
H2O
93.4
A
0
NH4+
69.1
H+
30.9
H2O
1130
NH3 (b)
4.74
3.39
H3PO4 (b)
13.2
1.64
H2O
82.1
A
0
NH4+
68.2
H+
31.8
H2O
849
NH3 (b)
5.89
4.46
H3PO4 (b)
16.6
2.18
H2O
77.5
A
0
NH4+
67.2
H+
32.8
H2O
589
NH3 (b)
7.62
6.33
H3PO4 (b)
21.7
3.14
H2O
70.6
A
0
NH4+
67.3
H+
32.7
H2O
432
NH3 (b)
9.40
8.65
H3PO4 (b)
26.8
4.28
H2O
63.8
A + B
0
NH4+
66.8
H+
33.2
H2O
432
NH3 (b)
9.33
8.58
H3PO4 (b)
26.8
4.28
H2O
63.9
A + B
0
NH4+
62.4
H+
37.6
H2O
374
NH3 (b)
9.60
9.26
H3PO4 (b)
29.5
4.95
H2O
60.9
B
0
NH4+
55.8
H+
44.2
H2O
267
NH3 (b)
10.5
11.6
H3PO4 (b)
36.2
6.93
H2O
53.3
B
0
NH4+
54.2
H+
45.8
H2O
241
NH3 (b)
10.8
12.5
H3PO4 (b)
38.3
7.68
H2O
50.9
B
0
NH4+
52.4
H+
47.6
H2O
210
NH3 (b)
11.2
13.8
H3PO4 (b)
41.1
8.81
H2O
47.6
B
0
NH4+
51.9
H+
48.1
H2O
212
NH3 (b)
11.1
13.6
H3PO4 (b)
41.0
8.73
H2O
47.9
B + C
0
NH4+
31.9
H+
68.1
H2O
211
NH3 (b)
7.14
8.39
H3PO4 (b)
42.9
8.77
H2O
50.0
B + C
0
NH4+
44.1
H+
55.9
H2O
462
NH3 (b)
6.08
5.30
H3PO4 (b)
26.5
4.00
H2O
67.4
C
0
NH4+
39.8
H+
60.2
H2O
656
NH3 (b)
4.30
3.37
H3PO4 (b)
20.7
2.82
H2O
75.0
C
0
NH4+
33.2
H+
66.8
H2O
924
NH3 (b)
2.76
1.99
H3PO4 (b)
15.9
2.00
H2O
81.3
C
0
NH4+
33.1
H+
66.9
H2O
920
NH3 (b)
2.76
2.00
H3PO4 (b)
16.0
2.01
H2O
81.2
C
0
NH4+
29.7
H+
70.3
H2O
799
NH3 (b)
2.78
2.06
H3PO4 (b)
18.0
2.32
H2O
79.2
C
0
NH4+
21.8
H+
78.2
H2O
483
NH3 (b)
3.01
2.50
H3PO4 (b)
26.5
3.83
H2O
70.5
C
0
NH4+
14.4
H+
85.6
H2O
213
NH3 (b)
3.34
3.75
H3PO4 (b)
44.4
8.68
H2O
52.2
C
0
NH4+
11.1
H+
88.9
H2O
77.2
NH3 (b)
3.90
7.98
H3PO4 (b)
67.4
24.0
H2O
28.7
C + D
0
NH4+
11.1
H+
88.9
H2O
75.9
NH3 (b)
3.92
8.12
H3PO4 (b)
67.7
24.4
H2O
28.4
C + D
0
NH4+
8.7
H+
91.3
H2O
66.3
NH3 (b)
3.21
7.28
H3PO4 (b)
70.9
27.9
H2O
25.9
D
0
NH4+
7.8
H+
92.2
H2O
57.8
NH3 (b)
2.99
7.49
H3PO4 (b)
73.6
32.0
H2O
23.4
D
0
NH4+
7.2
H+
92.8
H2O
43.8
NH3 (b)
2.93
9.12
H3PO4 (b)
78.2
42.2
H2O
18.9
D
0
NH4+
7.3
H+
92.7
H2O
34.2
NH3 (b)
3.10
11.8
H3PO4 (b)
81.5
54.1
H2O
15.4
D
0
NH4+
7.3
H+
92.7
H2O
33.0
NH3 (b)
3.12
12.3
H3PO4 (b)
82.0
56.0
H2O
14.9
D
0
NH4+
7.7
H+
92.3
H2O
25.8
NH3 (b)
3.39
16.6
H3PO4 (b)
84.6
71.7
H2O
12.0
D + E
0
NH4+
7.3
H+
92.7
H2O
20.1
NH3 (b)
3.31
20.2
H3PO4 (b)
87.0
92.0
H2O
9.65
E
0
NH4+
7.5
H+
92.5
H2O
10.6
NH3 (b)
3.56
39.3
H3PO4 (b)
91.1
174
H2O
5.33
E
0
NH4+
6.1
H+
93.9
H2O
24.1
NH3 (b)
2.73
14.1
H3PO4 (b)
85.9
76.8
H2O
11.4
F
0
NH4+
5.1
H+
94.9
H2O
29.2
NH3 (b)
2.24
9.7
H3PO4 (b)
84.2
63.4
H2O
13.6
F
0
NH4+
3.8
H+
96.2
H2O
34.6
NH3 (b)
1.64
6.1
H3PO4 (b)
82.6
53.5
H2O
15.8
F
0
NH4+
2.2
H+
97.8
H2O
40.7
NH3 (b)
0.93
3.0
H3PO4 (b)
80.9
45.4
H2O
18.2
F
0
NH4+
0.0
H+
100.0
H2O
48.7
NH3 (b)
0.00
0.0
H3PO4 (b)
78.8
38.0
H2O
21.2
F
0
NH4+
0.0
H+
100.0
H2O
48.2
NH3 (b)
0.00
0.0
H3PO4 (b)
79.0
38.4
H2O
21.0
F
50
NH4+
31.5
H+
68.5
H2O
302
NH3 (b)
5.80
5.79
H3PO4 (b)
35.3
6.13
H2O
58.9
C
50
NH4+
29.6
H+
70.4
H2O
277
NH3 (b)
5.75
5.93
H3PO4 (b)
37.3
6.68
H2O
57.0
C
50
NH4+
24.4
H+
75.6
H2O
200
NH3 (b)
5.70
6.77
H3PO4 (b)
44.8
9.25
H2O
49.5
C
50
NH4+
20.8
H+
79.2
H2O
146
NH3 (b)
5.67
7.91
H3PO4 (b)
52.2
12.6
H2O
42.1
C
50
NH4+
17.6
H+
82.4
H2O
95.9
NH3 (b)
5.66
10.2
H3PO4 (b)
61.7
19.3
H2O
32.6
C
50
NH4+
16.2
H+
83.8
H2O
73.5
NH3 (b)
5.67
12.2
H3PO4 (b)
67.1
25.2
H2O
27.2
C
50
NH4+
15.1
H+
84.9
H2O
50.1
NH3 (b)
5.81
16.7
H3PO4 (b)
73.8
36.9
H2O
20.4
C
50
NH4+
14.5
H+
85.5
H2O
29.7
NH3 (b)
6.10
27.1
H3PO4 (b)
80.7
62.3
H2O
13.2
C
Part 2. Composition of solutions saturated simultaneously with NH
4
H
2
PO
4
and (NH
4
)
2
HPO
4
.
t/°C
Chemical
1
Composition
1
[g/100 g H2O]
(a)
Chemical
2
Composition
2
[g/100 g H2O]
(a)
Chemical
3
10
2
* Mass Fraction w
3
m
3
[mol/kg]
Chemical
4
10
2
* Mass Fraction w
4
m
4
[mol/kg]
Chemical
5
10
2
* Mass Fraction w
5
0
NH4H2PO4
23.0
(NH4)2HPO4
57.1
NH3 (b)
10.1
10.6
H3PO4 (b)
34.4
6.32
H2O (b)
55.5
25
NH4H2PO4
41.4
(NH4)2HPO4
70.2
NH3 (b)
11.5
14.2
H3PO4 (b)
41.3
8.91
H2O (b)
47.3
50
NH4H2PO4
68.3
(NH4)2HPO4
87.8
NH3 (b)
12.8
19.2
H3PO4 (b)
48.2
12.6
H2O (b)
39.0
Notes:
Table 1
a
The composition unit is: mol/100 mol solute.
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
; D=NH
4
H
5
(PO
4
)
2
·H
2
O; E=NH
4
H
5
(PO
4
)
2
; F=H
3
PO
4
·0.5H
2
O.
Table 2
a
The composition unit is: g/100g H
2
O
Table 2
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:
Temperature: No information is given, but the compiler estimates the reproducibility to be about 0.5%.