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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Ammonium dihydrogenphosphate with Ammonium chloride, Potassium dihydrogenphosphate, Potassium chloride and Water
Components:
(1) Ammonium chloride; NH4Cl; [12125-02-9]
NIST Chemistry WebBook
for detail
(2) Ammonium dihydrogenphosphate; NH4H2PO4; [7722-76-1]
NIST Chemistry WebBook
for detail
(3) Potassium chloride; KCl; [7747-40-7]
NIST Chemistry WebBook
for detail
(4) Potassium dihydrogenphosphate; KH2PO4; [7778-77-0]
NIST Chemistry WebBook
for detail
(5) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Polosin, V.A.; Shakhparonov, M.I., Zh. Fiz. Khim. 21, 119 (1947).
Variables:
Concentration = Composition and temperature.
Prepared By:
J. Eysseltová
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Part 1. Solubility isotherms in the (NH
4
)
3
PO
4
-H
3
PO
4
-Ca
3
(PO
4
)
2
-H
2
O system with the ratio NH
3
/H
3
PO
4
= 0.5.
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)
-10
KCl
100.0
19.10
3.171
NH4H2PO4
0.00
0.00
0.00
H2O
1744
80.90
A
-10
KCl
94.40
17.75
2.954
NH4H2PO4
5.60
1.65
0.178
H2O
1772
80.60
A
-10
KCl
84.40
19.12
3.242
NH4H2PO4
5.60d
1.78
0.196
H2O
1613
79.10
B
-10
KCl
100.0
9.80
1.46
NH4H2PO4
0.00
0.00
0.00
H2O
1668
90.20
C
0
KCl
100.0
21.65
3.707
NH4H2PO4
0.00
0.00
0.00
H2O
1496
78.35
C
0
KCl
94.40
21.32
3.728
NH4H2PO4
5.60
1.98
0.224
H2O
1404
76.70
B
0
KCl
91.20
19.00
3.260
NH4H2PO4
8.80
2.83
0.315
H2O
1552
78.17
D
0
KCl
77.60
11.76
1.900
NH4H2PO4
22.40
5.24
0.549
H2O
2266
83.00
D
0
KCl
58.00
8.20
1.33
NH4H2PO4
42.00
9.18
0.966
H2O
2415
82.62
D
0
KCl
40.00
6.10
1.02
NH4H2PO4
60.00
14.08
1.533
H2O
2170
79.82
D
0
KCl
17.00
2.39
0.402
NH4H2PO4
83.00
17.81
1.940
H2O
2371
79.80
D
0
KCl
0.00
0.00
0.00
NH4H2PO4
100.0
18.50
1.973
H2O
2813
81.50
E
10
KCl
100.0
23.50
4.120
NH4H2PO4
0.00
0.00
0.00
H2O
1348
76.50
C
10
KCl
94.40
23.33
4.200
NH4H2PO4
5.60
2.17
0.253
H2O
1246
74.50
F
10
KCl
93.00
23.10
4.175
NH4H2PO4
7.60d
2.69
0.315
H2O
1226
74.21
F
10
KCl
77.60
13.56
2.262
NH4H2PO4
22.40
6.04
0.653
H2O
1903
80.40
D
10
KCl
65.40
10.90
1.823
NH4H2PO4
34.60
8.91
0.966
H2O
1991
80.19
D
10
KCl
47.50
8.10
1.39
NH4H2PO4
52.50
13.78
1.533
H2O
1898
78.12
D
10
KCl
32.20
5.00
1.03
NH4H2PO4
67.80
18.84
2.173
H2O
1734
75.36
D
10
KCl
17.00
2.85
0.504
NH4H2PO4
83.00
21.25
2.434
H2O
1890
75.90
D
10
KCl
0.00
0.00
0.00
NH4H2PO4
100.0
22.10
2.466
H2O
2251
77.90
E
20
KCl
100.0
25.70
4.639
NH4H2PO4
0.00
0.00
0.00
H2O
1195
74.30
C
20
KCl
94.40
24.89
4.586
NH4H2PO4
5.60
2.31
0.276
H2O
1135
72.80
F
20
KCl
90.40
22.63
4.120
NH4H2PO4
9.60
3.70
0.437
H2O
1218
73.67
F
20
KCl
77.60
15.36
2.648
NH4H2PO4
22.40
6.84
0.764
H2O
1625
77.80
D
20
KCl
71.00
13.70
2.366
NH4H2PO4
29.00
8.63
0.966
H2O
1666
77.67
D
20
KCl
53.90
10.20
1.792
NH4H2PO4
46.10
13.47
1.534
H2O
1671
76.33
D
20
KCl
40.10
8.00
1.46
NH4H2PO4
59.90
18.40
2.173
H2O
1529
73.60
D
20
KCl
20.00
3.90
0.726
NH4H2PO4
90.00d
24.02
2.897
H2O
1533
72.08
D
20
KCl
17.00
3.30
0.615
NH4H2PO4
83.00
24.70
2.982
H2O
1544
72.00
D
20
KCl
0.00
0.00
0.00
NH4H2PO4
100.0
26.30
3.102
H2O
1789
73.70
E
25
KCl
100.0
26.50
4.836
NH4H2PO4
0.00
0.00
0.00
H2O
1147
73.50
G
25
KCl
94.40
25.62
4.772
NH4H2PO4
5.60
2.38
0.287
H2O
1096
72.00
F
25
KCl
91.10
25.00
4.709
NH4H2PO4
8.90
3.80
0.464
H2O
1072
71.20
F
25
KCl
89.70
22.56
4.120
NH4H2PO4
10.30
4.00
0.473
H2O
1208
73.44
D
25
KCl
77.60
16.26
2.851
NH4H2PO4
22.44d
7.24
0.823
H2O
1510
76.50
D
25
KCl
73.30
15.00
2.630
NH4H2PO4
26.70
8.50
0.966
H2O
1544
76.50
D
25
KCl
56.70
11.30
2.010
NH4H2PO4
43.30
13.30
1.533
H2O
1567
75.40
D
25
KCl
43.50
9.10
1.68
NH4H2PO4
56.50
18.18
2.173
H2O
1441
72.72
D
25
KCl
29.60
6.40
1.32
NH4H2PO4
70.40
28.40
3.787
H2O
1347
65.20
D
25
KCl
17.00
3.54
0.678
NH4H2PO4
83.00
26.46
3.286
H2O
1401
70.00
D
25
KCl
0.00
0.00
0.00
NH4H2PO4
100.0
28.40
3.448
H2O
1476
71.60
E
35
KCl
100.0
27.70
5.138
NH4H2PO4
0.00
0.00
0.00
H2O
1077
72.30
G
35
KCl
94.40
27.17
5.184
NH4H2PO4
5.60
2.53
0.313
H2O
1010
70.30
F
35
KCl
90.70
24.96
4.712
NH4H2PO4
9.30
4.00
0.489
H2O
1067
71.04
D
35
KCl
86.90
22.28
4.121
NH4H2PO4
13.10
5.20
0.623
H2O
1170
72.52
D
35
KCl
77.60
18.00
3.262
NH4H2PO4
22.40
8.00
0.940
H2O
1320
74.00
D
35
KCl
77.00
17.80
3.227
NH4H2PO4
23.00
8.22
0.966
H2O
1323
73.98
D
35
KCl
62.60
14.00
2.569
NH4H2PO4
37.40
12.90
1.534
H2O
1353
73.10
D
35
KCl
49.30
11.40
2.157
NH4H2PO4
50.20
17.72
2.173
H2O
1282
70.88
D
35
KCl
39.60
9.60
1.899
NH4H2PO4
60.40
22.60
2.898
H2O
1152
67.80
D
35
KCl
17.00
4.01
0.717
NH4H2PO4
83.00
20.99
2.433
H2O
1165
75.00
D
Part 2. Monovariant and invariant points
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)
-10.4
KCl
100.0
19.80
3.311
NH4H2PO4
0.00
0.00
0.00
H2O
1680
80.20
A + C
22.2
KCl
100.0
26.20
4.761
NH4H2PO4
0.00
0.00
0.00
H2O
1165
73.80
B + F
-2.4
KCl
0.00
0.00
0.00
NH4H2PO4
100.0
17.30
1.819
H2O
3053
82.70
A + E
-11.2
KCl
92.40
18.40
3.114
NH4H2PO4
7.60
2.35
0.258
H2O
1645
79.25
A + B + E
12.5
KCl
91.70
22.30
4.012
NH4H2PO4
8.30
3.15
0.367
H2O
1267
74.55
B + D + F
-11.0
KCl
94.40
18.80
3.176
NH4H2PO4
5.60
1.80
0.197
H2O
1645
79.40
A + B
8.0
KCl
94.40
23.05
4.133
NH4H2PO4
5.60
2.15
0.250
H2O
1266
74.80
B + Fd
-4.9
KCl
17.00
2.15
0.353
NH4H2PO4
83.00
16.05
1.706
H2O
2698
81.80
A + D
-5.0
KCl
25.30
3.20
0.522
NH4H2PO4
74.70
14.52
1.534
H2O
2701
82.28
A + D
-5.7
KCl
52.20
6.60
1.05
NH4H2PO4
47.80
9.34
0.966
H2O
2750
84.06
A + D
-6.5
KCl
77.60
10.52
1.664
NH4H2PO4
22.40
4.68
0.480
H2O
2589
84.80
A + D
-8.6
KCl
88.50
14.90
2.434
NH4H2PO4
11.50
2.98
0.315
H2O
2020
82.12
A + D
2.7
KCl
92.50
21.80
3.875
NH4H2PO4
7.50
2.74
0.316
H2O
1324
75.46
B + D
9.8
KCl
61.30e
22.70
4.117
NH4H2PO4
8.70
3.35
0.394
H2O
1230
73.95
D + F
24.0
KCl
91.10
25.00
4.709
NH4H2PO4
8.90
3.80
0.464
H2O
1072
71.20
D + F
Notes:
Table 1
a
The composition unit is: mol/100 mol of solute.
Table 1
b
These values were calculated by the compiler based on the mass % values of the components.
Table 1
c
The solid phases are: A=ice; B=α-(NH
4
,K)Cl; C=α-KCl; D=(NH
4
,K)H
2
PO
4
; E=NH
4
H
2
PO
4
; F=β-(NH
4
,K)Cl; G= β-KCl.
Table 1
d
This is an obvious error.
Table 2
a
The composition unit is: mol/100 mol of solute.
Table 2
b
The molalities were calculated by the compiler and are based on the mass % values of the components.
Table 2
c
The solid phases are: A=ice; B=α-(NH
4
,K)Cl; C=α,KCl; D=(NH
4
,K)H
2
PO
4
; E=NH
4
H
2
PO
4
F=β-(NH
4
,K)Cl; G=β,KCl.
Table 2
d
In this line, the expression "β-(NH
4
H
2
K)Cl" stands for one of the solid phases. The compiler believes that this is an error.
Table 2
e
This is obviously an error. The correct value is 91.30.
Method/Apparatus/Procedure:
A polythermic method was used. Solid carbon dioxide served as the cooling agent.
Source and Purity of Materials:
All materials were recrystallized twice and analyzed before being used. No further details are given.
Estimated Errors:
Solubility: No information is given.
Temperature: No information is given.