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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Ammonium dihydrogenphosphate with Ammonium nitrate and Water
Components:
(1) Ammonium dihydrogenphosphate; NH4H2PO4; [7722-76-1]
NIST Chemistry WebBook
for detail
(2) Ammonium nitrate; NH4NO3; [6484-52-2]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Fridman, S.D.; Polyakov, N.N.; Skum, L.S.; Kirindasova, R.Ya., Khim. Prom. (Moscow) 1967, 43, 206.
Variables:
Concentration = Temperature and composition
Prepared By:
J. Eysseltová
Experimental Remarks:
Remarks: The temperature of disappearance of the last crystal is reported as a linear function of the water content of the saturated solution, Eq. [1]:
t
=ah(100
w
3
) [1]
The values of the constants a and b depend on the NH
4
H
2
PO
4
/NH
4
NO
3
ratio only and are given in Table I. NOTE: The solubility isotherms were derived from the experimental data. NOTE: For all these solutions, NH
4
H
2
PO
4
was the equilibrium solid phase.
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Table I. Values of the constants a and b in equation (1).
Chemical
1
Comment(s)
Relation of NH<4>H<2>PO<4>/NH<4>NO<3> = 10:90
a= 155.0, b=2.08
20:80
a= 170.5, b=2.12
30:70
a= 176.0, b=2.12
42:58
a= 180.5, b=2.12
55:45
a= 182.5, b=2.12
70:30
a= 188.5, b=2.33
80:20
a= 191.5, b=2.45
Table II. Solubility in the NH
4
H
2
PO
4
-NH
4
NO
3
-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
100
NH4H2PO4
7.4
2.46
NH4NO3
66.5
31.8
H2O
26.1
100
NH4H2PO4
13.4
3.52
NH4NO3
53.5
20.2
H2O
33.1
100
NH4H2PO4
19.2
4.64
NH4NO3
44.8
15.5
H2O
36.0
100
NH4H2PO4
43.5
9.98
NH4NO3
18.6
6.13
H2O
37.9
100
NH4H2PO4
50.4
11.8
NH4NO3
12.6
4.25
H2O
37.0
110
NH4H2PO4
7.9
3.22
NH4NO3
70.8
41.5
H2O
21.3
110
NH4H2PO4
14.3
4.38
NH4NO3
57.3
25.2
H2O
28.4
110
NH4H2PO4
20.7
5.79
NH4NO3
48.2
19.4
H2O
31.1
110
NH4H2PO4
28.0
7.31
NH4NO3
38.7
14.5
H2O
33.3
110
NH4H2PO4
36.2
9.23
NH4NO3
29.7
10.9
H2O
34.1
110
NH4H2PO4
46.5
12.0
NH4NO3
19.9
7.40
H2O
33.6
110
NH4H2PO4
53.6
14.1
NH4NO3
13.4
5.07
H2O
33.0
120
NH4H2PO4
8.3
4.37
NH4NO3
75.2
56.9
H2O
16.5
120
NH4H2PO4
15.3
5.64
NH4NO3
61.1
32.3
H2O
23.6
120
NH4H2PO4
22.0
7.22
NH4NO3
51.5
24.3
H2O
26.5
120
NH4H2PO4
30.0
9.15
NH4NO3
41.5
8.2
H2O
28.5
120
NH4H2PO4
38.8
11.5
NH4NO3
31.8
13.5
H2O
29.4
120
NH4H2PO4
49.4
14.6
NH4NO3
21.2
9.01
H2O
29.4
120
NH4H2PO4
56.8
17.0
NH4NO3
14.2
6.12
H2O
29.0
130
NH4H2PO4
8.8
6.5
NH4NO3
79.4
84.1
H2O
11.8
130
NH4H2PO4
16.2
7.41
NH4NO3
64.8
42.6
H2O
19.0
130
NH4H2PO4
23.5
9.37
NH4NO3
54.7
31.4
H2O
21.8
130
NH4H2PO4
32.0
11.6
NH4NO3
44.1
23.0
H2O
23.9
130
NH4H2PO4
41.5
14.7
NH4NO3
33.9
17.2
H2O
24.6
130
NH4H2PO4
52.4
18.2
NH4NO3
22.5
11.2
H2O
25.1
130
NH4H2PO4
60.08
20.97
NH4NO3
15.02
7.535
H2O
24.9
140
NH4H2PO4
9.3
11.5
NH4NO3
83.7
149.4
H2O
7.0
140
NH4H2PO4
17.2
10.5
NH4NO3
68.6
60.3
H2O
14.2
140
NH4H2PO4
24.9
12.7
NH4NO3
58.0
42.4
H2O
17.1
140
NH4H2PO4
33.9
15.3
NH4NO3
46.9
30.5
H2O
19.2
140
NH4H2PO4
44.0
19.1
NH4NO3
36.0
22.5
H2O
20.0
140
NH4H2PO4
55.5
23.3
NH4NO3
23.8
14.4
H2O
20.7
140
NH4H2PO4
63.4
26.5
NH4NO3
15.8
9.49
H2O
20.8
150
NH4H2PO4
9.8
38.7
NH4NO3
88.0
499.7
H2O
2.2
150
NH4H2PO4
18.1
16.6
NH4NO3
72.4
95.2
H2O
9.5
150
NH4H2PO4
26.3
18.4
NH4NO3
61.3
61.8
H2O
12.4
150
NH4H2PO4
35.9
21.5
NH4NO3
49.6
42.7
H2O
14.5
150
NH4H2PO4
46.6
26.5
NH4NO3
38.1
31.1
H2O
15.3
150
NH4H2PO4
59.9
36.2
NH4NO3
25.7
22.3
H2O
14.4
150
NH4H2PO4
66.6
34.5
NH4NO3
16.6
12.3
H2O
16.8
160
NH4H2PO4
19.0
34.4
NH4NO3
76.2
198.3
H2O
4.8
160
NH4H2PO4
27.7
30.9
NH4NO3
64.5
103.3
H2O
7.8
160
NH4H2PO4
37.9
33.6
NH4NO3
52.3
66.7
H2O
9.8
160
NH4H2PO4
49.1
39.9
NH4NO3
40.2
46.9
H2O
10.7
160
NH4H2PO4
61.5
43.8
NH4NO3
26.3
26.9
H2O
12.2
160
NH4H2PO4
69.8
47.4
NH4NO3
17.4
17.0
H2O
12.8
170
NH4H2PO4
20.0
869.3
NH4NO3
79.8
4984.5
H2O
0.2
170
NH4H2PO4
29.1
87.2
NH4NO3
68.0
292.9
H2O
2.9
170
NH4H2PO4
39.9
68.0
NH4NO3
55.0
134.7
H2O
5.1
170
NH4H2PO4
51.1
67.3
NH4NO3
42.3
80.1
H2O
6.6
170
NH4H2PO4
64.4
70.0
NH4NO3
27.6
43.1
H2O
8.0
170
NH4H2PO4
73.0
72.9
NH4NO3
18.3
26.3
H2O
8.7
180
NH4H2PO4
41.9
1214.1
NH4NO3
57.8
2406.8
H2O
0.3
180
NH4H2PO4
54.3
363.1
NH4NO3
44.4
426.7
H2O
1.3
180
NH4H2PO4
67.4
158.3
NH4NO3
28.9
97.6
H2O
3.7
180
NH4H2PO4
76.2
140.9
NH4NO3
19.1
50.8
H2O
4.7
Notes:
Table 1
a
The molalities were calculated by the compiler.
Method/Apparatus/Procedure:
A visual polythermic method was used.
Source and Purity of Materials:
No information is given.
Estimated Errors:
Solubility: No information is given.
Temperature: The precision of the temperature of disappearance of the last crystal was ± 0.5 K.