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:
   Flatt, R.; Brunisholz, G.; Denereaz, A., Helv. Chim. Acta 1956, 39, 483.

Variables:

   Concentration = Composition at 50 ºC

Prepared By:
   J. Eysseltová

Experimental Data:   (Notes on the Nomenclature)
(Please see footnotes following the table(s).)

Composition of saturated solutions in the (NH₄)₃-PO₄-H₃PO₄-H₂O system at 25 °C.
Chemical₁	Mass Fraction w₁	Chemical₂	Mole Fraction₂^(a)	Chemical₃	10² * Mass Fraction w₃	m₃ [mol/kg]	Chemical₄	10² * Mass Fraction w₄	m₄ [mol/kg]	Chemical₅	10² * Mass Fraction w₅^(b)	Solid Phase(s)^(c)
NH4+	22.7	H2O	171.8	NH3 (b)	5.73	7.33	H3PO4 (b)	48.4	10.8	H2O (b)	45.87	A + B
NH4+	33.4	H2O	309.6	NH3 (b)	6.04	5.99	H3PO4 (b)	34.7	5.97	H2O (b)	59.26	A + B
NH4+	33.4	H2O	312.6	NH3 (b)	6.01	5.93	H3PO4 (b)	34.5	5.92	H2O (b)	59.49	B
NH4+	39.4	H2O	233.2	NH3 (b)	8.24	9.38	H3PO4 (b)	40.1	7.93	H2O (b)	51.63	B
NH4+	43.3	H2O	187.2	NH3 (b)	10.0	12.8	H3PO4 (b)	44.3	9.88	H2O (b)	45.73	B
NH4+	46.0	H2O	150.5	NH3 (b)	11.1	17.0	H3PO4 (b)	48.3	12.3	H2O (b)	40.11	B + C
NH4+	49.5	H2O	111.0	NH3 (b)	13.8	24.8	H3PO4 (b)	53.5	16.7	H2O (b)	32.74	C
NH4+	49.7	H2O	111.3	NH3 (b)	13.8	24.8	H3PO4 (b)	53.4	16.6	H2O (b)	32.78	C
NH4+	53.3	H2O	154.5	NH3 (b)	13.0	19.1	H3PO4 (b)	47.0	12.0	H2O (b)	40.01	C
NH4+	55.5	H2O	176.6	NH3 (b)	12.8	17.4	H3PO4 (b)	44.2	10.5	H2O (b)	43.04	C
NH4+	59.0	H2O	217.6	NH3 (b)	12.3	15.1	H3PO4 (b)	39.9	8.50	H2O (b)	47.86	C
NH4+	62.8	H2O	250.0	NH3 (b)	12.1	13.9	H3PO4 (b)	37.0	7.40	H2O (b)	50.95	C
NH4+	65.5	H2O	274.7	NH3 (b)	12.0	13.2	H3PO4 (b)	35.0	6.73	H2O (b)	53.04	C
NH4+	66.2	H2O	278.3	NH3 (b)	12.0	13.2	H3PO4 (b)	34.7	6.65	H2O (b)	53.30	C
NH4+	66.3	H2O	274.2	NH3 (b)	12.1	13.4	H3PO4 (b)	35.0	6.75	H2O (b)	52.92	C
NH4+	68.1	H2O	281.7	NH3 (b)	12.2	13.4	H3PO4 (b)	34.4	6.57	H2O (b)	53.42	C

Notes:
   Table 1  ^a  The composition unit is mol/100 mol solute.
   Table 1  ^b  These values were calculated by the compiler.
   Table 1  ^c  The solid phases are: A=NH₄H₂PO₄; B=(NH₄)₂HPO₄; C=(NH₄)₇H₂(PO)₄)₃.

Method/Apparatus/Procedure:
   No information is given.

Source and Purity of Materials:
   No information is given.

Estimated Errors:

   Temperature: No information is given. The compiler estimates the reproducibility to be about 0.5 %.