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 Water
Components:
(1) Ammonium dihydrogenphosphate; NH4H2PO4; [7722-76-1]
NIST Chemistry WebBook
for detail
(2) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Bergman, A.G.; Tashtemirov, R., Ukr. Khim. Zh. 1967, 33, 565.
Variables:
Concentration = Temperature and composition.
Prepared By:
J. Eysseltová
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility in the NH
4
H
2
PO
4
-H
2
O system.
t/°C
10
2
* Mass Fraction w
1
m
1
[mol/kg]
(a)
Solid Phase(s)
(b)
-2
10
0.966
A
-4
17
1.78
A
-4.5
18
1.91
A + B
-1.6
19
2.04
B
+2.5
20
2.17
B
+9.5
22.5
2.52
B
+22.5
27.5
3.30
B
+32.5
32.5
4.19
B
+35.5
34
4.48
B + C
+39
35
4.68
C
+46.5
37.5
5.22
C
+51.5
40
5.80
C
Notes:
Table 1
a
The molalities were calculated by the compiler.
Table 1
b
The solid phases are: A=ice; B=α-NH
4
H
2
PO
4
; C=β-NH
4
H
2
PO
4
.
Method/Apparatus/Procedure:
A visual polythermic method was used. A mixture of solid carbon dioxide and acetone was used as the cooling agent.
Source and Purity of Materials:
Reagent grade NH
4
H
2
PO
4
was used. It had a melting point of 200 °C.
Estimated Errors:
Solubility: No information is given.
Temperature: No information is given.