IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Ammonia with Phosphoric acid and Water

Components:
   (1) Ammonia; NH3; [7664-41-7]  NIST Chemistry WebBook for detail
   (2) Phosphoric acid; H3PO4; [7664-38-2]  NIST Chemistry WebBook for detail
   (3) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Voogd, M., Over de Bereiding von Mono- en Diammoniumphosphaat. (Technical Univisity Delft--in honor of P.E.C. Scheffer) quoted in Gmelins Handbuch der anorganischen Chemie, 8th ed., 1936, Springer 1974, p. 419.

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 NH₄H₂PO₄-(NH₄)₂HPO₄-H₂O system.
t/°C	Chemical₁	m₁ [mol/kg]^(a)	Chemical₂	m₂ [mol/kg]^(a)	Chemical₃	10² * Mass Fraction w₃^(b)	m₃ [mol/kg]^(b)	Chemical₄	10² * Mass Fraction w₄^(b)	m₄ [mol/kg]^(b)	Chemical₅	10² * Mass Fraction w₅^(b)	Solid Phase(s)^(c)
60	NH4+	8.29	PO43-	5.72	NH3	14.1	27.8	H3PO4	56.1	19.2	H2O	29.8	A + B
55	NH4+	8.13	PO43-	5.60	NH3	13.8	26.0	H3PO4	54.9	17.9	H2O	31.3	"
50	NH4+	7.97	PO43-	5.47	NH3	13.6	24.3	H3PO4	53.6	16.7	H2O	32.8	"
45	NH4+	7.78	PO43-	5.31	NH3	13.3	22.4	H3PO4	52.0	15.3	H2O	34.7	"
40	NH4+	7.64	PO43-	5.18	NH3	13.0	21.1	H3PO4	50.8	14.3	H2O	36.2	"
60	NH4+	7.39	PO43-	5.22	NH3	12.6	20.4	H3PO4	51.2	14.4	H2O	36.3	A
55	NH4+	5.73	PO43-	4.53	NH3	9.76	12.5	H3PO4	44.4	9.88	H2O	45.8	"
60	NH4+	8.20	PO43-	5.54	NH3	14.0	25.8	H3PO4	54.3	17.4	H2O	31.7	B
55	NH4+	7.49	PO43-	4.65	NH3	12.8	18.0	H3PO4	45.6	11.2	H2O	41.7	"

Notes:
   Table 1  ^a  The composition units are: mol/1000 g solution.
   Table 1  ^b  All these data were calculated by the compiler
   Table 1  ^c  The solid phases are: A=NH₄H₃PO₄; B=(NH₄)₂HPO₄.

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.

References:
   ¹ Gmelins Handbuch der anorganischen Chemie, 8th ed., 1934, Springer, p. 419 (1974).