Home
Introduction
Search Menu
IUPAC Series (PDF)
Reference
Version History
About the Project
Disclaimer
Contact Us
Acknowledgements
IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Ammonium dihydrogenphosphate with Urea, 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) Urea; CH4N2O; [57-13-6]
NIST Chemistry WebBook
for detail
(4) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Pozin, M.E.; Kopylev, B.A.; Shilling, N.A., Izv. Vissh. Ucheb. Zaved., Khim. Khim. Tekhnol. 8, 883 (1965).
Variables:
Concentration = Composition at 10 ºC.
Prepared By:
J. Eysseltová
Experimental Remarks:
Remarks: NOTE: The authors state that the equilibrium solid phase is NH
4
H
2
PO
4
.
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Supersaturation in the NH
4
H
2
PO
4
-NH
4
NO
3
-CO(NH
2
)
2
-H
2
O system at 10 °C
Solution number
Chemical
1
Composition
1
(a)
10
2
* Mass Fraction w
1
Chemical
2
Composition
2
(a)
Chemical
3
Composition
3
(a)
Comment(s)
1
NH4NO3
12.8
40 (total solute)
NH4H2PO4
51.2
CO(NH2)2
36
Total Nutrition: solute 59.12, soln 23.6
2
NH4NO3
15
37
NH4H2PO4
60
CO(NH2)2
25
61.12, 22.6
3
NH4NO3
16.1
30
NH4H2PO4
64.4
CO(NH2)2
19.5
62.29, 18.7
4
NH4NO3
22
40
NH4H2PO4
33
CO(NH2)2
45
52.58, 20.9
5
NH4NO3
27.2
37
NH4H2PO4
40.8
CO(NH2)2
32
53.9, 19.9
6
NH4NO3
28
35
NH4H2PO4
42
CO(NH2)2
30
54.81, 19.2
7
NH4NO3
30
30
NH4H2PO4
45
CO(NH2)2
25
55.38, 16.6
8
NH4NO3
30
40
NH4H2PO4
30
CO(NH2)2
40
51.36, 20.0
9
NH4NO3
32.5
37
NH4H2PO4
32.5
CO(NH2)2
35
51.79, 19.15
10
NH4NO3
39.5
35
NH4H2PO4
39.5
CO(NH2)2
21
52.80, 18.5
11
NH4NO3
41.5
30
NH4H2PO4
41.5
CO(NH2)2
17
53.13, 15.95
12
NH4NO3
52.7
40
NH4H2PO4
26.3
CO(NH2)2
21
47.65, 19.1
13
NH4NO3
60.7
37
NH4H2PO4
30.3
CO(NH2)2
9
47.85, 17.7
14
NH4NO3
61.3
35
NH4H2PO4
30.7
CO(NH2)2
8
47.85, 16.4
15
NH4NO3
63.3
30
NH4H2PO4
31.7
CO(NH2)2
5
47.94, 14.1
Part 2. The compiler has calculated the following concentration values from the data in Part 1.
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
m
3
[mol/kg]
Chemical
4
10
2
* Mass Fraction w
4
1
NH4NO3
5.1
1.1
NH4H2PO4
20.5
2.97
CO(NH2)2
14.4
4.0
H2O
60
2
NH4NO3
5.6
1.1
NH4H2PO4
22.2
3.06
CO(NH2)2
9.2
2.4
H2O
63
3
NH4NO3
4.8
0.86
NH4H2PO4
19.3
2.40
CO(NH2)2
5.9
1.4
H2O
70
4
NH4NO3
8.8
1.8
NH4H2PO4
13.2
1.91
CO(NH2)2
18.0
5.0
H2O
60
5
NH4NO3
10.4
2.00
NH4H2PO4
15.1
2.08
CO(NH2)2
11.8
3.13
H2O
63
6
NH4NO3
9.8
1.9
NH4H2PO4
14.7
1.97
CO(NH2)2
10.5
2.69
H2O
65
7
NH4NO3
9.0
1.6
NH4H2PO4
13.5
1.68
CO(NH2)2
7.5
1.8
H2O
70
8
NH4NO3
12.0
2.5
NH4H2PO4
12.0
1.74
CO(NH2)2
16.0
4.44
H2O
60
9
NH4NO3
11.8
2.35
NH4H2PO4
12.2
1.68
CO(NH2)2
13.0
3.42
H2O
63
10
NH4NO3
13.8
2.66
NH4H2PO4
13.8
1.85
CO(NH2)2
7.4
1.9
H2O
65
11
NH4NO3
12.4
2.22
NH4H2PO4
12.4
1.55
CO(NH2)2
5.1
1.2
H2O
70
12
NH4NO3
21.1
4.39
NH4H2PO4
10.5
1.52
CO(NH2)2
8.4
2.3
H2O
60
13
NH4NO3
22.5
4.45
NH4H2PO4
11.2
1.55
CO(NH2)2
3.3
0.88
H2O
63
14
NH4NO3
21.5
4.12
NH4H2PO4
10.7
1.44
CO(NH2)2
2.8
0.72
H2O
65
15
NH4NO3
19.0
3.39
NH4H2PO4
9.5
1.2
CO(NH2)2
1.5
0.36
H2O
70
Notes:
Table 1
a
The composition unit is: mass % of solute.
Method/Apparatus/Procedure:
Mixtures of dry salts and water were stirred vigorously (900 rpm to 1200 rpm) and heated 1 °C to 2 °C above the temperature at which the last crystal disappeared. The solution was then cooled at the rate of 1 deg/hr to 2 deg/hr and the temperature at which the last crystal disappeared was observed. The supersaturation isotherms were constructed graphically.
Source and Purity of Materials:
Chemically pure salts were recrystallized three times before use.
Estimated Errors:
Solubility: No information is given.
Temperature: No information is given.