IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Ammonium dihydrogenphosphate with Diammonium hydrogenphosphate, Triammonium phosphate 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) Triammonium phosphate; (NH4)3PO4; [10361-65-6]  NIST Chemistry WebBook for detail
   (4) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Ross, W.H.; Herz, A.R.; Jacob, K.D., Ind. Eng. Chem. 1929, 21, 286.

Variables:

   Concentration = Composition at 25 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.
Chemical₁	Composition₁ [g/100 g H2O]	10² * Mass Fraction w₁^(b)	m₁ [mol/kg]^(b)	Chemical₂	10² * Mass Fraction w₂^(b)
NH4H2PO4	40.0	28.6	3.48	H2O	71.4
(NH4)2HPO4	69.5	41.0	5.26	H2O	59.0
(NH4)3PO4	17.7	15.0	1.25	H2O	85.0

Notes:
   Table 1  ^a  The composition unit is g/100 g H₂O.
   Table 1  ^b  These values were calculated by the compiler.

Method/Apparatus/Procedure:
   No information is given.

Source and Purity of Materials:
   No information is given.

Estimated Errors:
   Solubility: No information is given.
   Temperature: No information is given.