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:
   Volkov, A.A.; Sosnina, O.E.; Sedavnykh, L.S., Uch. Zap. Permsk. Gos. Univ. 1973, 289, 9.

Variables:

   Concentration = Composition at 20 ºC

Prepared By:
   J. Eysseltová

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

Solubility in the (NH₄)₃PO₄-H₃PO₄H₂O system at 20 °C.
Chemical₁	10² * Mass Fraction w₁	Chemical₂	10² * Mass Fraction w₂	Chemical₃	10² * Mass Fraction w₃	m₃ [mol/kg]	Chemical₄	10² * Mass Fraction w₄	m₄ [mol/kg]	Chemical₅	10² * Mass Fraction w₅	Solid Phase(s)^(b)	Refractive Index
(NH4)3PO4	12.80	H3PO4	0.00	NH3 (a)	4.39	2.98	H3PO4 (a)	8.41	0.985	H2O (a)	87.20	A	1.3580
(NH4)3PO4	15.20	H3PO4	2.00	NH3 (a)	5.21	3.69	H3PO4 (a)	11.99	1.48	H2O (a)	82.80	A	1.3670
(NH4)3PO4	18.70	H3PO4	4.10	NH3 (a)	6.41	4.87	H3PO4 (a)	16.39	2.17	H2O (a)	77.20	A	1.3370
(NH4)3PO4	21.30	H3PO4	5.25	NH3 (a)	7.30	5.84	H3PO4 (a)	19.25	2.67	H2O (a)	73.45	A	1.3855
(NH4)3PO4	26.05	H3PO4	6.75	NH3 (a)	8.93	7.80	H3PO4 (a)	23.87	3.62	H2O (a)	67.20	A	1.3970
(NH4)3PO4	27.15	H3PO4	7.25	NH3 (a)	9.30	8.33	H3PO4 (a)	25.10	3.90	H2O (a)	65.60	A	1.4050
(NH4)3PO4	29.35	H3PO4	8.45	NH3 (a)	10.06	9.49	H3PO4 (a)	27.74	4.55	H2O (a)	62.20	A	1.4090
(NH4)3PO4	30.50	H3PO4	9.00	NH3 (a)	10.45	10.14	H3PO4 (a)	29.05	4.90	H2O (a)	60.50	A + B	1.4100
(NH4)3PO4	30.10	H3PO4	10.00	NH3 (a)	10.31	10.11	H3PO4 (a)	29.78	5.07	H2O (a)	59.90	B	1.4100
(NH4)3PO4	31.00	H3PO4	11.70	NH3 (a)	10.62	10.89	H3PO4 (a)	32.08	5.71	H2O (a)	57.30	B	1.4130
(NH4)3PO4	32.00	H3PO4	13.70	NH3 (a)	10.96	11.86	H3PO4 (a)	34.73	6.53	H2O (a)	54.30	B	1.4170
(NH4)3PO4	32.30	H3PO4	14.70	NH3 (a)	11.07	12.26	H3PO4 (a)	35.93	6.92	H2O (a)	53.00	B	1.4180
(NH4)3PO4	33.00	H3PO4	16.50	NH3 (a)	11.31	13.15	H3PO4 (a)	38.19	7.73	H2O (a)	50.50	B	1.4210
(NH4)3PO4	33.40	H3PO4	17.45	NH3 (a)	11.44	13.67	H3PO4 (a)	39.40	8.18	H2O (a)	49.15	B	1.4235
(NH4)3PO4	34.50	H3PO4	18.55	NH3 (a)	11.82	14.79	H3PO4 (a)	41.23	8.96	H2O (a)	46.95	B	1.4260
(NH4)3PO4	36.00	H3PO4	21.15	NH3 (a)	12.34	16.90	H3PO4 (a)	44.81	10.67	H2O (a)	42.85	B	1.4280
(NH4)3PO4	35.85	H3PO4	22.55	NH3 (a)	12.28	17.34	H3PO4 (a)	46.11	11.31	H2O (a)	41.60	B + C	1.4300
(NH4)3PO4	32.60	H3PO4	23.00	NH3 (a)	11.17	14.77	H3PO4 (a)	44.43	10.21	H2O (a)	44.40	C	1.4260
(NH4)3PO4	29.35	H3PO4	21.30	NH3 (a)	10.06	11.97	H3PO4 (a)	40.59	8.39	H2O (a)	49.35	C	1.4180
(NH4)3PO4	26.40	H3PO4	20.50	NH3 (a)	9.05	10.00	H3PO4 (a)	37.85	7.27	H2O (a)	53.10	C	1.4100
(NH4)3PO4	24.20	H3PO4	20.10	NH3 (a)	8.29	8.74	H3PO4 (a)	36.01	6.60	H2O (a)	55.70	C	1.4040
(NH4)3PO4	19.80	H3PO4	19.35	NH3 (a)	6.78	6.55	H3PO4 (a)	32.36	5.43	H2O (a)	60.85	C	1.3935
(NH4)3PO4	17.60	H3PO4	18.45	NH3 (a)	6.03	5.54	H3PO4 (a)	30.02	4.79	H2O (a)	63.95	C	1.3860
(NH4)3PO4	14.30	H3PO4	16.30	NH3 (a)	4.90	4.15	H3PO4 (a)	25.70	3.78	H2O (a)	69.40	C	1.3780
(NH4)3PO4	12.10	H3PO4	16.40	NH3 (a)	4.15	3.41	H3PO4 (a)	24.35	3.48	H2O (a)	71.50	C	1.3700
(NH4)3PO4	11.75	H3PO4	17.00	NH3 (a)	4.03	3.32	H3PO4 (a)	24.72	3.54	H2O (a)	71.25	C	1.3730
(NH4)3PO4	12.10	H3PO4	20.25	NH3 (a)	4.15	3.60	H3PO4 (a)	28.20	4.25	H2O (a)	67.65	C	1.3770
(NH4)3PO4	11.75	H3PO4	22.25	NH3 (a)	4.03	3.58	H3PO4 (a)	29.97	4.63	H2O (a)	66.00	C	1.3780
(NH4)3PO4	11.35	H3PO4	25.35	NH3 (a)	3.89	3.61	H3PO4 (a)	32.81	5.29	H2O (a)	63.30	C	1.3800
(NH4)3PO4	11.75	H3PO4	26.90	NH3 (a)	4.03	3.85	H3PO4 (a)	34.62	5.76	H2O (a)	61.35	C	1.3805
(NH4)3PO4	11.75	H3PO4	29.80	NH3 (a)	4.03	4.04	H3PO4 (a)	37.52	6.55	H2O (a)	58.45	C	1.3880
(NH4)3PO4	11.75	H3PO4	34.85	NH3 (a)	4.03	4.43	H3PO4 (a)	42.57	8.13	H2O (a)	53.40	C	1.3910
(NH4)3PO4	12.85	H3PO4	41.25	NH3 (a)	4.40	5.63	H3PO4 (a)	49.70	11.05	H2O (a)	45.90	C	1.3990
(NH4)3PO4	13.20	H3PO4	49.20	NH3 (a)	4.52	7.06	H3PO4 (a)	57.88	15.71	H2O (a)	37.60	C	1.4090
(NH4)3PO4	13.95	H3PO4	55.10	NH3 (a)	4.78	9.07	H3PO4 (a)	64.27	21.19	H2O (a)	30.95	C	1.4225
(NH4)3PO4	14.10	H3PO4	58.40	NH3 (a)	4.83	10.32	H3PO4 (a)	67.67	25.11	H2O (a)	27.50	C	1.4280
(NH4)3PO4	14.70	H3PO4	60.80	NH3 (a)	5.04	12.07	H3PO4 (a)	70.4	29.35	H2O (a)	24.50	C	1.4330
(NH4)3PO4	14.85	H3PO4	64.60	NH3 (a)	5.09	14.54	H3PO4 (a)	74.6	36.92	H2O (a)	20.55	C	1.4390
(NH4)3PO4	15.35	H3PO4	70.40	NH3 (a)	5.26	21.67	H3PO4 (a)	80.49	57.64	H2O (a)	14.25	C	1.4420
(NH4)3PO4	15.30	H3PO4	71.40	NH3 (a)	5.24	23.15	H3PO4 (a)	81.46	62.50	H2O (a)	13.30	C + D	1.4430
(NH4)3PO4	13.70	H3PO4	72.75	NH3 (a)	4.69	20.34	H3PO4 (a)	81.75	61.57	H2O (a)	13.55	D	1.4435
(NH4)3PO4	13.20	H3PO4	75.30	NH3 (a)	4.52	23.10	H3PO4 (a)	83.98	74.51	H2O (a)	11.50	D + E	1.4440
(NH4)3PO4	12.20	H3PO4	76.40	NH3 (a)	4.18	21.53	H3PO4 (a)	84.42	75.56	H2O (a)	11.40	E	1.4460
(NH4)3PO4	11.60	H3PO4	78.10	NH3 (a)	3.98	22.66	H3PO4 (a)	85.72	84.93	H2O (a)	10.30	E	1.4465
(NH4)3PO4	10.90	H3PO4	80.40	NH3 (a)	3.74	25.21	H3PO4 (a)	87.56	102.7	H2O (a)	8.70	E	1.4750
(NH4)3PO4	10.95	H3PO4	81.50	NH3 (a)	3.75	29.18	H3PO4 (a)	88.70	119.9	H2O (a)	7.55	E	1.4480

Notes:
   Table 1  ^a  These values were calculated by the compiler.
   Table 1  ^b  The solid phases are: A=(NH₄)₃PO₄·3H₂O; B=(NH₄)₃HPO₄; C=NH₄H₂PO₄; D=3NH₄H₂PO₄·H₃PO₄: E=NH₄H₂PO₄·H₃PO₄.

Method/Apparatus/Procedure:
   The method of sections^1,2 was used. The solubility diagram is derived from the linear dependence of a property of the liquid phase on the concentration.

Source and Purity of Materials:
   Chemically pure H₃ PO₄ and twice-distilled water were used. (NH₄)₃PO₄·3H₂O was synthesized according to directions given by others.³

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

References:
   ¹Mertslin, R.V. Izv. Biol. Nauchno-issl. In-ta pri Permsk. Un-ta 1937, 11, 1.
   ²Zhuravlev, E.F.; Sheveleva, A.D. Zh. Neorg. Khim. 1960, 5, 2630.
   ³Pozin, M.E. Tekhnologiya Mineral'nykh Soley, Leningrad, Goskhimizdat, 1961.