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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Ammonia with Tetraphosphoric acid and Water
Components:
(1) Ammonia; NH3; [7664-41-7]
NIST Chemistry WebBook
for detail
(2) Tetraphosphoric acid; H6P4O13; [13813-62-2]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Farr, T.D.; Willard, J.W.; Hatfield, J.D., J. Chem. Eng. Data 1972, 17, 313.
Variables:
Concentration = Composition at 273 K.
Prepared By:
J. Eysseltová
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility values in the NH
3
-H
6
P
4
O
13
-H
2
O system at 273 K.
pH
Chemical
1
10
2
* Mass Fraction w
1
Chemical
2
10
0
* Mass Fraction w
2
Chemical
3
10
0
* Mass Fraction w
3
m
3
[mol/kg]
Chemical
4
10
0
* Mass Fraction w
4
m
4
[mol/kg]
Chemical
5
10
0
* Mass Fraction w
5
Solid Phase(s)
(b)
2.25
N
8.94
P2O5
46.00
NH3 (a)
10.87
18.57
H5P3O10 (a)
54.76
4.71
H2O (a)
34.37
A
2.81
N
9.24
P2O5
46.06
NH3 (a)
11.23
19.44
H5P3O10 (a)
54.83
4.78
H2O (a)
33.93
A
3.56
N
9.65
P2O5
46.67
NH3 (a)
11.73
21.06
H5P3O10 (a)
55.56
5.03
H2O (a)
32.71
A
3.66
N
9.81
P2O5
46.67
NH3 (a)
11.93
21.54
H5P3O10 (a)
55.56
5.06
H2O (a)
32.51
A
4.07
N
10.56
P2O5
48.32
NH3 (a)
12.84
25.44
H5P3O10 (a)
57.52
5.74
H2O (a)
29.64
A
4.02
N
10.77
P2O5
48.64
NH3 (a)
13.09
26.51
H5P3O10 (a)
57.90
5.91
H2O (a)
29.01
A + B
4.25
N
10.72
P2O5
47.76
NH3 (a)
13.03
25.42
H5P3O10 (a)
56.86
5.59
H2O (a)
30.11
B
4.74
N
10.83
P2O5
45.83
NH3 (a)
13.17
23.96
H5P3O10 (a)
54.56
5.00
H2O (a)
32.27
B
4.83
N
10.95
P2O5
45.52
NH3 (a)
13.31
24.05
H5P3O10 (a)
54.19
4.93
H2O (a)
32.50
B
4.85
N
11.03
P2O5
45.58
NH3 (a)
13.41
24.36
H5P3O10 (a)
54.26
4.97
H2O (a)
32.33
C
5.47
N
10.70
P2O5
43.15
NH3 (a)
13.01
21.44
H5P3O10 (a)
51.37
4.27
H2O (a)
35.62
C
5.76
N
10.37
P2O5
38.84
NH3 (a)
12.61
17.99
H5P3O10 (a)
46.24
3.32
H2O (a)
41.15
C
5.76
N
10.38
P2O5
38.64
NH3 (a)
12.62
17.91
H5P3O10 (a)
46.00
3.29
H2O (a)
41.38
C
6.28
N
10.31
P2O5
36.07
NH3 (a)
12.54
16.53
H5P3O10 (a)
42.94
2.85
H2O (a)
44.52
C
----
N
11.00 (c)
P2O5
45.50 (c)
NH3 (a)
13.37
24.19
H5P3O10 (a)
54.17
4.94
H2O (a)
32.46
B + C
Notes:
Table 1
a
These values were calculated by the compiler.
Table 1
b
The solid phases are: A=(NH
4
)
4
H
6
P
4
O
13
; B=(NH
4
)
5
HP
4
O
13
·H
2
O; C=(NH
4
)
6
P
4
O
13
·2H
2
O.
Table 1
c
The composition of this invariant point was estimated graphically from plots of pH vs N or P
2
O
5
.
Method/Apparatus/Procedure:
A stock solution was prepared by saturating conductivity water with (NH
4
)
6
P
4
O
13
·2H
2
O. Portions of this solution were adjusted with either anhydrous ammonia or the H-form of Amberlite IR-120 resin to a selected pH value and evaporated under vacuum at about 298 K to crystallization. The mixture was then equilibrated in a cold room for 15 days to 48 days. Phosphorus was determined gravimetrically as quinolinium molybdophosphate (1), and nitrogen was determined by distillation of ammonia with NaOH. The pH was measured, after warming to 298 K, with a conventional meter and a glass electrode.
Source and Purity of Materials:
(NH
4
)
6
P
4
O
13
·2H
2
O of sufficient purity was prepared by a modification of 2 published procedures
2,3
. Conductivity water was used.
Estimated Errors:
Temperature: The only information given is that the temperature was kept constant to within ± 0.5 K.
References:
1
C. H. Perrin, J. Assoc. Offic. Agr. Chem.
41
, 758 (1958).
2
G. J. Griffith, J. Inorg. Nucl. Chem.
26
, 1381 (1964).
3
R. K. Osterheld and R. P. Langguth, J. Phys. Chem.
59
, 76 (1955).