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 and Water
Components:
(1) Ammonium dihydrogenphosphate; NH4H2PO4; [7722-76-1]
NIST Chemistry WebBook
for detail
(2) Urea; CH4N2O; [57-13-6]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Sarbaev, A.N.; Polyakov, E.V.; Polyakova, Z.A.; Ruchkova, A.Kh.; Tyunina, M.F.; Gushchina, L.I.; Mart'yanova, L.I., Khim. Prom. (Moscow) 1974, 50, 516.
Variables:
Concentration = Composition and temperature in solutions with N/P
2
O
5
ratios of 2:1 and 3:1.
Prepared By:
J. Eysseltová
Experimental Remarks:
The authors report the data found in Refs. 2 and 3. In addition, they report their own data at temperatures above 40 °C. These data are presented with temperature and the total content of salt components as the coordinates. The compiler has recalculated their data as follows. According to the authors, decomposition of urea occurs at temperatures above 70 °C.
Experimental Data:
(Notes on the Nomenclature)
Table I. Solubility data for the NH
4
H
2
PO
4
-CO(NH
2
)
2
-H
2
O system in solutions having a N/P
2
O
5
ratio of 2:1.
t/°C
Chemical
1
10
2
* 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
40
total salts
61.0
NH4H2PO4
14.8
3.30
CO(NH2)2
46.2
19.7
H2O
39.0
50
total salts
64.8
NH4H2PO4
15.7
3.88
CO(NH2)2
49.1
23.2
H2O
35.2
60
total salts
68.8
NH4H2PO4
16.7
4.65
CO(NH2)2
52.1
27.8
H2O
31.2
70
total salts
72.9
NH4H2PO4
17.7
5.68
CO(NH2)2
55.2
33.9
H2O
27.1
80
total salts
77.1
NH4H2PO4
18.7
7.10
CO(NH2)2
58.4
42.5
H2O
22.9
90
total salts
81.3
NH4H2PO4
19.7
9.16
CO(NH2)2
61.6
54.8
H2O
18.7
100
total salts
85.7
NH4H2PO4
20.8
12.6
CO(NH2)2
64.9
75.6
H2O
14.3
110
total salts
90.1
NH4H2PO4
21.8
19.2
CO(NH2)2
68.3
114.8
H2O
9.9
120
total salts
94.5
NH4H2PO4
22.5
36.2
CO(NH2)2
71.6
216.7
H2O
5.5
130
total salts
98.9
NH4H2PO4
24.0
189.5
CO(NH2)2
74.9
1134.1
H2O
1.1
Table II. Solubility data for the NH
4
H
2
PO
4
-CO(NH
2
)
2
-H
2
O system in solutions having a N/P
2
O
5
ratio of 3:1.
t/°C
Chemical
1
10
2
* 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
40
total salts
69.2
NH4H2PO4
11.2
3.16
CO(NH2)2
58.0
31.4
H2O
30.8
50
total salts
73.3
NH4H2PO4
11.8
3.84
CO(NH2)2
61.5
38.3
H2O
26.7
60
total salts
77.1
NH4H2PO4
12.5
4.75
CO(NH2)2
64.6
47.0
H2O
22.9
70
total salts
79.3
NH4H2PO4
12.8
5.38
CO(NH2)2
66.5
53.5
H2O
20.7
80
total salts
82.4
NH4H2PO4
13.3
6.57
CO(NH2)2
69.1
65.4
H2O
17.6
90
total salts
86.3
NH4H2PO4
13.9
8.82
CO(NH2)2
72.4
87.9
H2O
13.7
100
total salts
90.9
NH4H2PO4
14.7
14.0
CO(NH2)2
76.2
139.4
H2O
9.1
Method/Apparatus/Procedure:
The method has been described earlier.
1
Source and Purity of Materials:
CO(NH
2
)
2
was GOST 6691-67; NH
4
H
2
PO
4
was GOST 3771-64. No other information is given.
Estimated Errors:
Solubility: No information is given.
Temperature: No information is given.
References:
1
Krichevskiy, I.R.; Khazanova, N.E.; Liushic, L.R. Zh. Fiz. Khim. 1957,
31
, 2711.
2
Blidin, V.P. Zh. Obshch. Khim. 1941,
11
, 887.
3
Polyakov, E.V.; Mart'yanova, L.I. Sarbaev, A.N. Zh. Prikl. Khim. (Leningrad) 1974,
47
, 1507.