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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:
Shenkin, Ya.S.; Ruchnova, S.A.; Shenkina, A.P., Zh. Neorg. Khim. 1969, 14, 1420.
Variables:
Concentration = Temperature and composition at atmospheric pressure.
Prepared By:
J. Eysseltová
Experimental Remarks:
Remarks: NOTE: According to the authors, the "temperature depression" (not defined) is a nearly linear function of lg N.
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Composition and boiling points in the NH
4
H
2
PO
4
-H
3
PO
4
-H
2
O system.
Boiling Point/°C
Chemical
1
10
2
* Mass Fraction w
1
Chemical
2
10
2
* Mass Fraction w
2
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
Mole Fractio
5
n
-lg N (b)
Comment(s)
109.4
NH4H2PO4
71.84
H3PO4
0.00
NH3 (a)
10.63
22.18
H3PO4 (a)
61.20
22.18
H2O (a)
28.16
0.1463
0.1463 -lg N (b)
110.8
NH4H2PO4
67.90
H3PO4
1.82
NH3 (a)
10.05
19.49
H3PO4 (a)
59.66
20.11
H2O (a)
30.28
0.1343
0.1343
111.1
NH4H2PO4
64.20
H3PO4
8.90
NH3 (a)
9.50
20.75
H3PO4 (a)
63.59
24.12
H2O (a)
26.90
0.1568
0.1568
112.0
NH4H2PO4
60.01
H3PO4
14.12
NH3 (a)
8.88
20.16
H3PO4 (a)
65.24
25.73
H2O (a)
25.87
0.1656
0.1656
115.1
NH4H2PO4
57.22
H3PO4
22.34
NH3 (a)
8.47
24.33
H3PO4 (a)
71.08
35.49
H2O (a)
20.44
0.1865
0.1865
119.2
NH4H2PO4
59.44
H3PO4
23.21
NH3 (a)
8.80
29.78
H3PO4 (a)
73.85
43.43
H2O (a)
17.35
0.2510
0.2510
122.9
NH4H2PO4
58.29
H3PO4
29.02
NH3 (a)
8.63
39.93
H3PO4 (a)
78.68
63.26
H2O (a)
12.69
0.3633
0.3633
147.0
NH4H2PO4
64.53
H3PO4
30.98
NH3 (a)
9.55
124.9
H3PO4 (a)
85.95
195.3
H2O (a)
4.49
0.6556
0.6556
152.0
NH4H2PO4
71.50
H3PO4
24.64
NH3 (a)
10.58
161.0
H3PO4 (a)
85.55
226.2
H2O (a)
3.86
0.7054
0.7054
155.6
NH4H2PO4
76.76
H3PO4
19.50
NH3 (a)
11.36
178.4
H3PO4 (a)
84.89
231.6
H2O (a)
3.74
0.7146
0.7146
149.8
NH4H2PO4
79.72
H3PO4
16.24
NH3 (a)
11.80
171.5
H3PO4 (a)
84.15
212.5
H2O (a)
4.04
0.6840
0.6840
161.0
NH4H2PO4
82.82
H3PO4
14.71
NH3 (a)
12.26
291.5
H3PO4 (a)
85.26
352.2
H2O (a)
2.47
0.8662
0.8662
170.8
NH4H2PO4
83.17
H3PO4
14.75
NH3 (a)
12.31
347.6
H3PO4 (a)
85.60
419.9
H2O (a)
2.08
0.9318
0.9318
170.0
NH4H2PO4
86.60
H3PO4
12.31
NH3 (a)
12.82
690.6
H3PO4 (a)
86.08
805.9
H2O (a)
1.09
1.1906
1.1906
212.0
NH4H2PO4
90.56
H3PO4
6.00
NH3 (a)
13.41
228.8
H3PO4 (a)
83.15
246.6
H2O (a)
3.44
0.7375
0.7375
210.5
NH4H2PO4
90.56
H3PO4
8.19
NH3 (a)
13.41
629.8
H3PO4 (a)
85.34
696.6
H2O (a)
1.25
1.1805
1.1805
221.5
NH4H2PO4
92.77
H3PO4
4.39
NH3 (a)
13.73
283.9
H3PO4 (a)
83.42
299.7
H2O (a)
2.84
0.9079
0.9079
Notes:
Table 1
a
These values were calculated by the compilers.
Table 1
b
N is the mol fraction of water in the system.
Method/Apparatus/Procedure:
The method was the same as that described earlier.
1
Source and Purity of Materials:
Chemically pure salts were recrystallized before being used.
Estimated Errors:
Solubility: No information is given.
Temperature: No information is given.
References:
1
Shenkin, Ya.S.; Ruchnova, S.A.; Shenkina, A.P. Zh. Neorg. Khim. 1968,
13
, 256.