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 Diammonium hydrogenphosphate and Water
Components:
(1) Ammonium dihydrogenphosphate; NH4H2PO4; [7722-76-1]
NIST Chemistry WebBook
for detail
(2) Diammonium hydrogenphosphate; (NH4)2HPO4; [7783-28-0]
NIST Chemistry WebBook
for detail
(3) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
Original Measurements:
Akiyama, T.; Kanzaki, H.; Minagawa, S., Nippon Dojo Hiryogaku Zasshi 49, 243 (1978).
Variables:
Concentration = Composition at 273 K, 298 K and 323 K.
Prepared By:
Hiroshi Miyamoto
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility of NH
4
H
2
PO
4
in water.
t/°C
10
2
* Mass Fraction w
1
m
1
[mol/kg]
(a)
0
19.2
2.07
25
29.7
3.67
50
40.6
5.94
Solubility of (NH
4
)
2
HPO
4
in water.
t/°C
10
2
* Mass Fraction w
1
m
1
[mol/kg]
(a)
0
36.3
4.32
25
41.6
5.39
50
47.0
6.72
Notes:
Table 2
a
These values were calculated by the compiler.
Method/Apparatus/Procedure:
The NH
4
H
2
PO
4
or (NH
4
)
2
HPO
4
was added to water in a glass-stoppered bottle and heated on a water bath at 90 °C. The mixture was then allowed to settle at a given temperature for 7 days. Total nitrogen content in the saturated solutions was determined by chemical analysis. The phosphate content was determined as P
2
O
5
.
Source and Purity of Materials:
Chemically pure ammonium salts were used.
Estimated Errors:
Solubility: Nothing is specified.
Temperature: Nothing is specified.