IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: Ammonium dihydrogenphosphate with Diammonium hydrogenphosphate and Water

   (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.


   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.
Chemical1102 * Mass Fraction w1Mole Fraction1m1 [mol/kg](a)Chemical2102 * Mass Fraction w2(a)
NH4H2PO428.3 3.43H2O71.7
(NH4)2HPO441.1 5.28H2O58.9
   Table 1  a  These values were calculated by the compiler.

   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.