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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:
Askenasy, P.; Nessler, F., F.Z. Anorg. Chem. 189, 305 (1930).
Variables:
Concentration = Composition at 0 ºC.
Prepared By:
J. Eysseltová
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Part 1. The authors’ data: Points of simultaneous crystallization of several solid phases in the K
+
, NH
4
+
|| Cl
, H
2
PO
4
- H
2
O system at 0 °C.
Solution number
Chemical
1
10
2
* Mole Fraction
1
Chemical
2
10
2
* Mole Fraction
2
Chemical
3
10
2
* Mole Fraction
3
Chemical
4
10
2
* Mole Fraction
4
Chemical
5
10
2
* Mole Fractio
5
n
Solid Phase(s)
(a)
ρ [g/cm3]
1
H2PO4-
7.6
Cl-
92.4
K+
8.0
NH4+
92.0
H2O
925
"NH4Cl" + "NH4H2PO4"
1.1100
2
H2PO4-
7.7
Cl-
92.3
K+
12.1
NH4+
87.9
H2O
905
"NH4Cl" + "NH4H2PO4"
1.1134
3
H2PO4-
8.1
Cl-
91.9
K+
17.9
NH4+
82.1
H2O
888
"NH4Cl" + "NH4H2PO4"
1.1300
4
H2PO4-
8.5
Cl-
91.5
K+
24.4
NH4+
75.6
H2O
850
"NH4Cl" + "NH4H2PO4"
1.1335
5
H2PO4-
8.7
Cl-
91.3
K+
28.7
NH4+
71.3
H2O
810
ternary eutectic point
1.1385
6
H2PO4-
8.3
Cl-
91.7
K+
29.8
NH4+
70.2
H2O
865
"KCl" + "KH2PO4"
1.1504
7
H2PO4-
8.3
Cl-
91.7
K+
32.7
NH4+
67.3
H2O
887
"KCl" + "KH2PO4"
1.1514
8
H2PO4-
7.5
Cl-
92.5
K+
66.6
NH4+
33.4
H2O
1135
"KCl" + "KH2PO4"
1.1657
9
H2PO4-
7.7
Cl-
92.3
K+
85.8
NH4+
14.2
H2O
1310
"KCl" + "KH2PO4"
1.1695
10
H2PO4-
7.3
Cl-
92.7
K+
90.0
NH4+
10.0
H2O
1380
"KCl" + "KH2PO4"
1.1740
11
H2PO4-
3.6
Cl-
96.4
K+
28.2
NH4+
71.8
H2O
845
"KCl" + "NH4Cl"
1.1272
Distribution of K
+
and NH
4
+
in the solid and liquid phases of the solutions existing in equilibrium with (K
2
NH
4
)H
2
PO
4
.
Solution number
Chemical
1
10
2
* Mole Fraction
1
Chemical
2
10
2
* Mole Fraction
2
Chemical
3
10
2
* Mole Fraction
3
Chemical
4
10
2
* Mole Fraction
4
Chemical
5
10
2
* Mole Fractio
5
n
Chemical
6
Mole Fraction
6
Mole Fraction
7
12
H2PO4-
9.8
Cl-
90.2
K+
57.8
NH4+
42.2
H2O
1090
K+
85.5
14.5
13
H2PO4-
45.9
Cl-
54.1
K+
49.2
NH4+
50.8
H2O
1690
K+
78.9
21.1
14
H2PO4-
33.8
Cl-
66.2
K+
45.5
NH4+
54.5
H2O
1680
K+
71.7
28.3
15
H2PO4-
27.4
Cl-
72.6
K+
42.7
NH4+
57.3
H2O
1450
K+
66.1
33.9
16
H2PO4-
27.2
Cl-
72.8
K+
43.3
NH4+
56.7
H2O
1565
K+
64.8
35.2
17
H2PO4-
19.7
Cl-
80.3
K+
40.9
NH4+
59.1
H2O
1135
K+
62.2
37.8
18
H2PO4-
13.1
Cl-
86.9
K+
38.9
NH4+
61.1
H2O
1130
K+
62.2
37.8
19
H2PO4-
26.7
Cl-
73.3
K+
44.2
NH4+
55.8
H2O
1555
K+
56.4
45.6
20
H2PO4-
24.5
Cl-
75.5
K+
36.9
NH4+
63.1
H2O
1665
K+
55.7
44.3
21
H2PO4-
9.8
Cl-
90.2
K+
26.6
NH4+
73.4
H2O
925
K+
31.2
68.8
22
H2PO4-
18.3
Cl-
81.7
K+
28.7
NH4+
71.3
H2O
1235
K+
29.2
70.8
Part 2. The compiler has recalculated the authors’ data to give the following values.
Solution number
Chemical
1
10
2
* Mass Fraction w
1
m
1
Chemical
2
10
2
* Mass Fraction w
2
m
2
Chemical
3
10
2
* Mass Fraction w
3
m
3
Chemical
4
10
2
* Mass Fraction w
4
m
4
Chemical
5
10
2
* Mass Fraction w
5
Solid Phase(s)
(a)
1
H2PO4-
3.25
0.45
Cl-
14.47
554
K+
1.38
0.48
NH4+
7.32
5.52
H2O
73.55
A + B
2
H2PO4-
3.33
0.47
Cl-
14.63
566
K+
2.11
0.74
NH4+
7.08
5.39
H2O
72.82
A + B
3
H2PO4-
3.53
0.50
Cl-
14.67
574
K+
3.15
1.11
NH4+
6.66
5.13
H2O
71.96
A + B
4
H2PO4-
3.80
0.55
Cl-
14.96
598
K+
4.39
1.59
NH4+
6.28
4.94
H2O
70.54
A + B
5
H2PO4-
4.00
0.59
Cl-
15.36
626
K+
5.32
1.96
NH4+
6.10
4.89
H2O
69.19
C
6
H2PO4-
3.64
0.53
Cl-
14.74
588
K+
5.28
1.91
NH4+
5.73
4.50
H2O
70.58
D + E
7
H2PO4-
3.57
0.51
Cl-
14.44
574
K+
5.67
2.04
NH4+
5.39
4.21
H2O
70.91
D + E
8
H2PO4-
2.63
0.36
Cl-
11.86
452
K+
9.41
3.25
NH4+
2.17
1.63
H2O
73.90
D + E
9
H2PO4-
2.39
0.32
Cl-
10.48
391
K+
10.74
3.63
NH4+
0.82
0.60
H2O
75.54
D + E
10
H2PO4-
2.17
0.29
Cl-
10.10
373
K+
10.81
3.62
NH4+
0.55
0.40
H2O
76.34
D + E
11
H2PO4-
1.63
0.23
Cl-
15.99
633
K+
5.15
1.85
NH4+
6.05
4.72
H2O
71.15
D + F
12
H2PO4-
3.54
0.49
Cl-
11.94
459
K+
8.43
2.94
NH4+
2.84
2.15
H2O
73.23
G
13
H2PO4-
11.23
1.50
Cl-
4.84
177
K+
4.85
1.61
NH4+
2.31
1.66
H2O
76.65
G
14
H2PO4-
8.48
1.11
Cl-
6.07
218
K+
4.60
1.50
NH4+
2.54
1.80
H2O
78.28
G
15
H2PO4-
7.80
1.04
Cl-
7.56
278
K+
4.90
1.63
NH4+
3.03
2.19
H2O
76.68
G
16
H2PO4-
7.30
0.96
Cl-
7.15
258
K+
4.68
1.53
NH4+
2.83
2.01
H2O
78.02
G
17
H2PO4-
6.86
0.96
Cl-
10.22
393
K+
5.74
2.00
NH4+
3.82
2.89
H2O
73.34
G
18
H2PO4-
4.65
0.64
Cl-
11.28
427
K+
5.56
1.91
NH4+
4.03
3.00
H2O
74.46
G
19
H2PO4-
7.21
0.95
Cl-
7.23
261
K+
4.81
1.57
NH4+
2.80
1.99
H2O
77.93
G
20
H2PO4-
6.31
0.81
Cl-
7.12
251
K+
3.83
1.23
NH4+
3.02
2.10
H2O
79.69
G
21
H2PO4-
4.10
0.58
Cl-
13.81
541
K+
4.49
1.59
NH4+
5.71
4.40
H2O
71.88
G
22
H2PO4-
6.05
0.82
Cl-
9.88
367
K+
3.82
1.29
NH4+
4.38
3.20
H2O
75.84
G
Notes:
Table 1
a
A formula in quotation marks refers to a solid solution rich in that component.
Table 2
a
The solid phases are: a="NH
4
Cl" B="NH
4
H
2
PO
4
"; C=ternary eutectic point; D="KCl"; E="KH
2
PO
4
"; F="NH
4
Cl"; G=a precipitate designated as (K,NH
4
)H
2
PO
4
. The quotation marks have the same meaning as on the preceding page.
Method/Apparatus/Procedure:
Binary eutonic solutions were prepared on the basis of a preliminary investigation of the boundary ternary systems. Samples on the curve for the simultaneous crystallization of two salts were then prepared by adding a third component. The mixtures were shaken in a thermostat for 2 to 4 days. The solid phase was isolated by centrifuging. The analytical methods are not described.
Source and Purity of Materials:
No information is given.
Estimated Errors:
Solubility: No information given.
Temperature: The temperature was controlled to within ± 0.1 K. No other information is given.