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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Ammonium dihydrogenphosphate with Ammonium 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) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Sorina, G.A.; Bezlyudova, L.T.; Mushkina, E.V.; Kozlovskaya, G.M.; Tsekhanskaya, Yu.V., Zh. Prikl. Khim. (Leningrad) 1987, 57, 947.
Variables:
Concentration = Temperature and composition at the mol ratio of N/P
2
O
5
= 1.
Prepared By:
J. Eysseltová
Experimental Remarks:
Remarks: Two sets of data are given.
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility in the NH
4
H
2
PO
4
-NH
4
NO
3
-H
2
O system at a mol ratio N/P
2
O
5
= 1.
t/°C
Chemical
1
Mass Fraction w
1
Chemical
2
10
2
* Mass Fraction w
2
m
2
[mol/kg]
Chemical
3
10
2
* Mass Fraction w
3
m
3
[mol/kg]
Chemical
4
10
2
* Mass Fraction w
4
20.5
solute
30.0 (100w1 + 100w2)
NH4NO3 (a)
17.6
3.14
NH4H2PO4 (a)
12.4
1.54
H2O (a)
70.0
48.0
solute
40.0
NH4NO3 (a)
23.4
4.87
NH4H2PO4 (a)
16.6
2.41
H2O (a)
60.0
72.5
solute
50.0
NH4NO3 (a)
29.3
7.32
NH4H2PO4 (a)
20.7
3.60
H2O (a)
50.0
94.5
solute
60.0
NH4NO3 (a)
35.2
11.0
NH4H2PO4 (a)
24.8
5.39
H2O (a)
40.0
106.5
solute
70.0
NH4NO3 (a)
41.0
17.1
NH4H2PO4 (a)
29.0
8.40
H2O (a)
30.0
Solubility in the NH
4
H
2
PO
4
-NH
4
NO
3
-H
2
O system at a mol ratio N/P
2
O
5
= 1.
Solution number
t/°C
Chemical
1
Mass Fraction w
1
100w1 + 100w2
ρ [g/cm3]
Comment(s)
1
20.0
Solute
30.0 (100w1 + 100w2)
1.146
- (viscosity, cp)
2
30.0
Solute
33.6
1.159
1.280
3
40.0
Solute
37.1
1.173
1.149
4
50.0
Solute
40.9
1.189
1.090
5
60.0
Solute
44.8
1.206
1.093
6
70.0
Solute
48.9
1.224
1.135
7
80.0
Solute
53.2
1.243
1.221
8
90.0
Solute
57.5
1.264
1.320
The compiler has calculated the following data:
Solution number
Chemical
1
10
2
* Mass Fraction w
1
m
1
[mol/kg]
Chemical
2
10
2
* Mass Fraction w
2
m
2
[mol/kg]
Chemical
3
10
2
* Mass Fraction w
3
1
NH4NO3
17.6
3.14
NH4H2PO4
12.4
1.54
H2O
70.0
2
NH4NO3
19.7
3.70
NH4H2PO4
13.9
1.82
H2O
66.4
3
NH4NO3
21.7
4.32
NH4H2PO4
15.4
2.12
H2O
62.9
4
NH4NO3
24.0
5.07
NH4H2PO4
16.9
2.49
H2O
59.1
5
NH4NO3
26.3
5.94
NH4H2PO4
18.5
2.92
H2O
55.2
6
NH4NO3
28.7
7.01
NH4H2PO4
20.2
3.44
H2O
51.1
7
NH4NO3
31.2
8.32
NH4H2PO4
22.0
4.09
H2O
46.8
8
NH4NO3
33.7
9.9
NH4H2PO4
23.8
4.87
H2O
42.5
Notes:
Table 1
a
These data were calculated by the compiler.
Method/Apparatus/Procedure:
A visual polythermic method was used. The density was measured by the use of a self-constructed pycnometer. Viscosity was measured with a standard capillary VPZH-2 viscometer (solutions more dilute than 50 %) or a viscometer according to Golubev.
1
Source and Purity of Materials:
Chemically pure salts and distilled water were used.
Estimated Errors:
Solubility: No information is given.
Temperature: Precision of temperature of disappearance of last crystal was ± 0.1 K; of density was ± 0.310 g/cm
3
; of viscosity was ± 2 % (concn< 50 %) and ± 7 % (more concd solns).
References:
1
Golubev, I.F.; Potikhova, T.M. Tr. GIAP, Moscow, ONTI 1971, pp 67-80.