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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Ammonium dihydrogenphosphate with Biuret and Water
Components:
(1) Ammonium dihydrogenphosphate; NH4H2PO4; [7722-76-1]
NIST Chemistry WebBook
for detail
(2) Biuret; C2H5N3O2; [108-19-0]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Bleshinskaya, L.S.; Sulaymankulov, K.S.; Davranov, M.D.; Yunusova, Z.Yu., VINITI Nr. 120, 1983.
Variables:
Concentration = Composition at 30 ºC
Prepared By:
J. Eysseltová
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility values in the NH
4
H
2
PO
4
-biuret-H
2
O system at 30 °C
Chemical
1
10
2
* Mass Fraction w
1
m
1
[mol/kg]
(a)
Chemical
2
10
2
* Mass Fraction w
2
m
2
[mol/kg]
(a)
Chemical
3
10
2
* Mass Fraction w
3
Solid Phase(s)
(b)
NH4H2PO4
---
---
NH(CONH2)2
3.08
0.306
H2O
96.92
A
NH4H2PO4
3.71
0.345
NH(CONH2)2
2.85
0.294
H2O
93.44
A
NH4H2PO4
9.42
0.928
NH(CONH2)2
2.37
0.259
H2O
88.21
A
NH4H2PO4
23.00
2.674
NH(CONH2)2
2.26
0.291
H2O
74.74
A
NH4H2PO4
28.32
3.526
NH(CONH2)2
1.89
0.261
H2O
69.79
A
NH4H2PO4
29.30
3.710
NH(CONH2)2
2.06
0.289
H2O
68.64
A + B
NH4H2PO4
29.28
3.707
NH(CONH2)2
2.08
0.292
H2O
68.64
A + B
NH4H2PO4
29.88
3.786
NH(CONH2)2
1.54
0.216
H2O
68.58
B
NH4H2PO4
30.44
3.855
NH(CONH2)2
0.94
0.13
H2O
68.62
B
NH4H2PO4
31.69
4.032
NH(CONH2)2
---
---
H2O
68.31
B
Notes:
Table 1
a
The molalities were calculated by the compiler.
Table 1
b
The solid phases are: A=NH(CONH
2
)
2
; B=NH
4
H
2
PO
4
.
Method/Apparatus/Procedure:
The isothermal method was used with 8 to 9 hours allowed for equilibration. Equilibrium was checked by repeated analyses. Ammonia content was determined by the formaldehyde method, total nitrogen by the Kjeldahl method, and biuret by the difference. No other details are given.
Source and Purity of Materials:
No information is given.
Estimated Errors:
Solubility: No information is given.
Temperature: No information is given.