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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:
Chomyakov, K.; Yaworovskaya, A.; Shirokikh, P., Z. Phys. Chem. A 1933, 167, 36.
Variables:
Concentration = Composition at 23 ºC.
Prepared By:
J. Eysseltová
Experimental Data:
(Notes on the Nomenclature)
(Please see footnotes following the table(s).)
Solubility of ammonium phosphates in water at 23 °C.
Chemical
1
10
2
* Mass Fraction w
1
Mole Fraction
1
m
1
[mol/kg]
(a)
Chemical
2
10
2
* Mass Fraction w
2
(a)
NH4H2PO4
28.3
3.43
H2O
71.7
(NH4)2HPO4
41.1
5.28
H2O
58.9
Notes:
Table 1
a
These values were calculated by the compiler.
Method/Apparatus/Procedure:
The solubility was found graphically from the plot of density vs composition.
Source and Purity of Materials:
All materials were from de Haen or Kahlbaum and were purified twice, pulverized, and dried in vacuum before being used.
Estimated Errors:
Solubility: No information is given.
Temperature: No information is given.