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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Ammonium dihydrogenphosphate with Ammonium nitrate, Potassium dihydrogenphosphate, Potassium 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) Potassium dihydrogenphosphate; KH2PO4; [7778-77-0]
NIST Chemistry WebBook
for detail
(4) Potassium nitrate; KNO3; [7757-79-1]
NIST Chemistry WebBook
for detail
(5) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Bochkarev, P.F., Tr. Vostoch.-Sibir. Gosud. Inst. 3 (1935); Bergman, A.G.; Bochkarev, P.F., Zh. Prikl. Khim. (Leningrad) 10, 1531 (1937); Bergman, A.G.; Bochkarev, P.F., Izv. Akad. Nauk SSSR, Otd. Mat. Estestv. Nauk 237 (1938).
Variables:
Concentration = Temperature and composition.
Prepared By:
L. V. Chernykh and J. Eysseltová
Experimental Remarks:
Remarks: NOTE: The above data are given in both source papers, but source paper (2) also contains data for the composition of solutions in equilibrium with two or three solid phases. These data are given below.
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility in the NH
4
H
2
PO
4
-KNO
3
-H
2
O system.
t/°C
Chemical
1
Composition
1
(a)
10
2
* Mass Fraction w
1
m
1
[mol/kg]
(b)
Chemical
2
Composition
2
(a)
10
2
* Mass Fraction w
2
m
2
[mol/kg]
(b)
Chemical
3
Composition
3
(a)
10
2
* Mass Fraction w
3
Solid Phase(s)
(c)
0
NH4H2PO4
100
18.4
2.0
KNO3
0
0.0
0.0
H2O
2832
81.6
A
0
NH4H2PO4
75.1
17.2
1.9
KNO3
24.9
5
0.6
H2O
2170
77.8
A
0
NH4H2PO4
62.3
15.8
1.8
KNO3
37.7
8.4
1.1
H2O
1909
75.8
A
0
NH4H2PO4
49.1
13.7
1.6
KNO3
50.9
11.6
1.5
H2O
1773
74.7
A + B
0
NH4H2PO4
53
11.6
1.3
KNO3
47
11.5
1.5
H2O
1990
76.9
B
0
NH4H2PO4
29.4
5.4
0.6
KNO3
70.6
11.4
1.4
H2O
2892
83.2
B
0
NH4H2PO4
0
0.0
0.0
KNO3
100
11.2
1.2
H2O
4448
88.8
B
10
NH4H2PO4
100
21.3
2.4
KNO3
0
0.0
0.0
H2O
2360
78.7
A
10
NH4H2PO4
78.9
20.4
2.4
KNO3
21.1
4.8
0.6
H2O
1847
74.8
A
10
NH4H2PO4
67.6
19.0
2.3
KNO3
32.4
8.0
1.1
H2O
1658
73.0
A
10
NH4H2PO4
55.2
16.4
2.0
KNO3
44.8
11.7
1.6
H2O
1546
71.9
A
10
NH4H2PO4
50.1
15.3
1.9
KNO3
49.9
13.4
1.9
H2O
1491
71.3
A
10
NH4H2PO4
41.5
13.0
1.6
KNO3
58.5
16.1
2.2
H2O
1445
70.9
A + B
10
NH4H2PO4
37.6
11
1.3
KNO3
62.4
16.0
2.2
H2O
1596
73.0
B
10
NH4H2PO4
21.7
5.1
0.6
KNO3
78.3
16.2
2.0
H2O
2136
78.7
B
10
NH4H2PO4
0
0.0
0.0
KNO3
100
16.6
2.0
H2O
2819
83.4
B
20
NH4H2PO4
100
25.5
3.0
KNO3
0
0.0
0.0
H2O
1866
74.5
A
20
NH4H2PO4
82.6
24.0
2.9
KNO3
17.6
4.5
0.6
H2O
1568
71.5
A
20
NH4H2PO4
80.79
22.5
2.8
KNO3
19.21
7.7
1.1
H2O
1681
69.8
A
20
NH4H2PO4
61.1
20
2.5
KNO3
38.9
11.2
1.6
H2O
1342
68.8
A
20
NH4H2PO4
50.2
17
2.2
KNO3
49.8
14.8
2.1
H2O
1287
68.2
A
20
NH4H2PO4
44
15.2
1.9
KNO3
56.0
17.0
2.5
H2O
1253
67.8
A
20
NH4H2PO4
32.2
11.8
1.5
KNO3
67.8
21.8
3.2
H2O
1159
66.4
A + B
20
NH4H2PO4
29.2
10.2
1.3
KNO3
70.8
21.7
3.2
H2O
1247
68.1
B
20
NH4H2PO4
15.5
4.7
0.6
KNO3
84.5
22.4
3.0
H2O
1542
72.9
B
20
NH4H2PO4
0
0.0
0.0
KNO3
100
23.0
3.0
H2O
1781
77.0
B
30
NH4H2PO4
100
30.2
3.8
KNO3
0
0.0
0.0
H2O
1475
69.8
A
30
NH4H2PO4
84.6
27.5
3.5
KNO3
15.4
4.4
0.6
H2O
1338
68.1
A
30
NH4H2PO4
75.8
26.0
3.4
KNO3
24.2
7.3
1.1
H2O
1242
66.7
A
30
NH4H2PO4
66.5
23.9
3.2
KNO3
33.5
10.6
1.6
H2O
1163
65.5
A
30
NH4H2PO4
51
19.2
2.6
KNO3
49.0
16.2
2.5
H2O
1096
64.6
A
30
NH4H2PO4
39.1
15.4
2.1
KNO3
60.9
21.1
3.3
H2O
1045
63.5
A
30
NH4H2PO4
25.6
10.6
1.5
KNO3
74.4
27.0
4.3
H2O
964
62.4
A + B
30
NH4H2PO4
23.5
9.5
1.3
KNO3
76.5
27.2
4.2
H2O
1000
63.3
B
30
NH4H2PO4
11.5
4.3
0.6
KNO3
88.5
29.0
4.3
H2O
1142
66.7
B
30
NH4H2PO4
0
0.0
0.0
KNO3
100
31.0
4.4
H2O
1249
69.0
B
Composition of solutions existing in equilibrium with two or three solid phases.
t/°C
Chemical
1
Composition
1
(a)
10
2
* Mass Fraction w
1
m
1
(b)
Chemical
2
Composition
2
(a)
10
2
* Mass Fraction w
2
m
2
(b)
Chemical
3
Composition
3
(a)
10
2
* Mass Fraction w
3
Solid Phase(s)
(c)
-4.4
KNO3
0
0
0
NH4H2PO4
100
17.4
1.83
H2O
3032
82.6
A + B
-5.3
KNO3
27.0
5.0
0.62
NH4H2PO4
73.0
15.4
1.68
H2O
2410
79.6
A + B
-6.0
KNO3
41.5
8.6
1.1
NH4H2PO4
58.5
13.8
1.55
H2O
2101
77.6
A + B
0.4
KNO3
49.7
12.0
1.60
NH4H2PO4
50.3
13.8
1.62
H2O
1726
74.2
B + C
12.6
KNO3
60.9
17.4
2.46
NH4H2PO4
39.1
12.7
1.58
H2O
1373
69.9
B + C
20.7
KNO3
68.2
22.0
3.28
NH4H2PO4
31.8
11.7
1.53
H2O
1152
66.3
B + C
32.7
KNO3
75.8
28.6
4.64
NH4H2PO4
24.2
10.4
1.48
H2O
907
61.0
B + C
-5.7
KNO3
47.8
9.5
1.2
NH4H2PO4
52.2
11.8
1.30
H2O
2223
79.7
A + C
-5.4
KNO3
50.1
9.5
1.2
NH4H2PO4
49.9
10.8
1.18
H2O
2356
78.7
A + C
-4.2
KNO3
67.2
9.7
1.1
NH4H2PO4
32.8
5.4
0.55
H2O
3300
84.9
A + C
-2.5
KNO3
100
9.8
1.1
NH4H2PO4
0
0
0
H2O
5169
90.2
A + C
-6.3
KNO3
45.3
9.6
1.2
NH4H2PO4
54.7
13.2
1.49
H2O
2043
77.2
A + B + C
Notes:
Table 1
a
The composition unit is: mol/100 mol solute.
Table 1
b
The molalities were calculated by the compilers.
Table 1
c
The solid phases are: A=NH
4
H
2
PO
4
; B=KNO
3
.
Table 2
a
The composition units are: mol/100 mol of solute.
Table 2
b
The molalities were calculated by the compilers. The unit is: mol kg
1
.
Table 2
c
The solid phases are: A=ice; B=NH
4
H
2
PO
4
; C=KNO
3
.
Method/Apparatus/Procedure:
A visual polythermic method was used.
Source and Purity of Materials:
Chemically pure materials were recrystallized before use.
Estimated Errors:
Solubility: No information is given.
Temperature: No information is given.