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.; Chapuis-Gottreux, S., Helv. Chim. Acta 1951, 34, 683.

Variables:

   Concentration = Composition at 25 ºC

Prepared By:
   J. Eysseltová

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

Composition of saturated solutions of the NH₄⁺-H⁺-PO₄^3—H₂O system at 25 °C.
Chemical₁	10² * Mass Fraction w₁	Chemical₂	10² * Mass Fraction w₂	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)	Mole Fractio₅n^(a)	Solid Phase(s)^(c)
NH4+	8.96	H+	91.04	NH3	4.34	93.82	H3PO4	92.94	349.0	H2O	2.72	5.30	A
NH4+	9.31	H+	90.69	NH3	4.31	36.90	H3PO4	88.83	132.1	H2O	6.86	14.00	A
NH4+	10.56	H+	89.44	NH3	4.69	27.13	H3PO4	85.16	85.64	H2O	10.15	21.60	A
NH4+	10.83	H+	89.17	NH3	4.80	27.57	H3PO4	84.98	84.85	H2O	10.22	21.80	A
NH4+	11.11	H+	88.89	NH3	4.86	25.58	H3PO4	83.97	76.76	H2O	11.16	24.10	B + C
NH4+	12.72	H+	87.28	NH3	5.44	25.39	H3PO4	81.99	66.54	H2O	12.57	27.80	C
NH4+	12.95	H+	87.05	NH3	5.32	19.69	H3PO4	78.81	50.68	H2O	15.87	36.50	C
NH4+	13.10	H+	86.90	NH3	5.37	19.65	H3PO4	78.59	49.99	H2O	16.04	37.00	C
NH4+	14.01	H+	85.99	NH3	4.64	8.54	H3PO4	63.49	20.33	H2O	31.87	91.00	C
NH4+	14.24	H+	85.76	NH3	4.66	8.41	H3PO4	62.78	19.68	H2O	32.56	94.00	C
NH4+	17.08	H+	82.92	NH3	4.48	5.81	H3PO4	50.30	11.35	H2O	45.22	163.0	C
NH4+	20.76	H+	79.24	NH3	4.39	4.68	H3PO4	40.56	7.52	H2O	55.05	246.0	C
NH4+	25.07	H+	74.93	NH3	4.28	3.99	H3PO4	32.72	5.30	H2O	63.00	349.0	C
NH4+	30.33	H+	69.67	NH3	4.20	3.56	H3PO4	26.54	3.91	H2O	69.26	473.0	C
NH4+	32.60	H+	67.40	NH3	4.25	3.53	H3PO4	25.04	3.61	H2O	70.71	512.0	C
NH4+	34.97	H+	65.03	NH3	4.71	3.98	H3PO4	25.85	3.80	H2O	69.44	487.0	C
NH4+	37.30	H+	62.70	NH3	5.53	4.92	H3PO4	28.43	4.39	H2O	66.04	421.0	C
NH4+	40.70	H+	59.30	NH3	6.81	6.55	H3PO4	32.10	5.36	H2O	61.09	345.0	C
NH4+	47.38d	H+	50.62 (d)	NH3	10.27	12.52	H3PO4	41.57	8.81	H2O	48.16	210.0	C
NH4+	49.80	H+	50.20	NH3	12.44	18.42	H3PO4	47.91	12.33	H2O	39.65	150.0	C + D
NH4+	58.63	H+	41.37	NH3	11.11	12.42	H3PO4	36.35	7.06	H2O	52.54	262.0	D
NH4+	65.57	H+	34.43	NH3	10.62	10.70	H3PO4	31.08	5.44	H2O	58.29	340.0	D
NH4+	68.23	H+	31.77	NH3	10.86	10.88	H3PO4	30.53	5.32	H2O	58.61	348.0	D + E
NH4+	68.01	H+	31.99	NH3	10.74	10.69	H3PO4	30.29	5.24	H2O	58.98	353.0	E
NH4+	68.95	H+	31.05	NH3	10.14	9.66	H3PO4	28.22	4.67	H2O	61.64	396.0	E
NH4+	69.81	H+	30.19	NH3	8.59	7.44	H3PO4	23.60	3.55	H2O	67.82	521.0	E
NH4+	100.0	H+	0.00	NH3	5.01	3.45	H3PO4	9.61	1.15	H2O	85.38	1610	E

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=(NH₄)H₃(PO₄)₂(?); B=(NH₄)₃H₉(PO₄)₄; C=NH₄H₂PO₄; D=(NH₄)₂HPO₄; E=(NH₄)₃PO₄.
   Table 1  ^d  COMPILER'S COMMENT: The mol % data for this solution appear to be incorrect.

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.