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:
   Muromtsev, B.A.; Nazarova, L.A., Izv. Akad. Nauk SSSR, otd. Estestv. i Mat. Nauk 1938, 177.

Variables:

   Concentration = Composition at 273 K, 298 K and 323 K

Prepared By:
   L.V. Chernykh and J. Eysseltová

Experimental Remarks:

   Remarks: ADDITIONAL DATA: In source paper 1 the composition of the solution saturated simultaneously with NH₄H₂PO₄ and (NH₄)₂HPO₄ at 323 K is reported as 13.81 mass % NH₃ (24.72 mol kg^–1 --compilers) and 53.37 mass % H₃PO₄ (8.36 mol kg^–1--compilers).

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

Table I. Solubility in the NH₃-H₃PO₄-H₂O system at 0 °C.
t/°C	Chemical₁	10² * Mass Fraction w₁^(a)	m₁ [mol/kg]^(a)	Chemical₂	10² * Mass Fraction w₂^(a)	m₂ [mol/kg]^(a)	Chemical₃	10² * Mass Fraction w₃	Chemical₄	10² * Mass Fraction w₄	10² * Mole Fraction₄	Chemical₅	10² * Mass Fraction w₅	10² * Mole Fractio₅n	Solid Phase(s)^(b)
0	NH3	23.71	18.27	H3PO4	0.070	0.009	H2O	76.22	(NH4)2O	36.25	16.45	P2O5	0.05	0.009	A
0	NH3	16.48	11.61	H3PO4	0.150	0.018	H2O	83.37	(NH4)2O	25.18	10.44	P2O5	0.11	0.017	"
0	NH3	13.88	9.49	H3PO4	0.230	0.027	H2O	85.89	(NH4)2O	21.21	8.53	P2O5	0.17	0.025	"
0	NH3	7.85	5.04	H3PO4	0.620	0.069	H2O	91.53	(NH4)2O	12.00	4.53	P2O5	0.45	0.062	"
0	NH3	3.22	1.99	H3PO4	1.88	0.202	H2O	94.90	(NH4)2O	4.92	1.78	P2O5	1.36	0.18	"
0	NH3	2.26	1.40	H3PO4	3.10	0.334	H2O	94.64	(NH4)2O	3.46	1.25	P2O5	2.24	0.30	"
0	NH3	2.41	1.53	H3PO4	5.24	0.579	H2O	92.35	(NH4)2O	3.68	1.35	P2O5	3.79	0.51	"
0	NH3	3.65	2.47	H3PO4	9.65	1.14	H2O	86.70	(NH4)2O	5.58	2.14	P2O5	6.99	0.98	"
0	NH3	7.14	5.75	H3PO4	19.92	2.79	H2O	72.94	(NH4)2O	10.90	4.70	P2O5	14.42	2.28	"
0	NH3	7.78	6.49	H3PO4	21.81	3.16	H2O	70.41	(NH4)2O	11.89	5.25	P2O5	15.80	2.56	"
0	NH3	8.18	6.97	H3PO4	22.92	3.39	H2O	68.90	(NH4)2O	12.50	5.59	P2O5	16.60	2.72	"
0	NH3	8.35	7.19	H3PO4	23.50	3.52	H2O	68.15	(NH4)2O	12.76	5.75	P2O5	17.02	2.81	"
0	NH3	9.34	8.56	H3PO4	26.56	4.23	H2O	64.10	(NH4)2O	14.28	6.68	P2O5	19.22	3.30	A + B
0	NH3	9.97	10.15	H3PO4	32.35	5.72	H2O	57.68	(NH4)2O	15.23	7.57	P2O5	23.43	4.27	B
0	NH3	10.12	10.50	H3PO4	33.26	5.99	H2O	56.62	(NH4)2O	15.49	7.78	P2O5	24.07	4.43	"
0	NH3	10.71	12.22	H3PO4	37.84	7.50	H2O	51.45	(NH4)2O	16.39	8.68	P2O5	27.40	5.32	"
0	NH3	11.14	13.68	H3PO4	41.06	8.77	H2O	47.80	(NH4)2O	17.04	9.37	P2O5	29.75	6.00	B + C
0	NH3	8.60	8.76	H3PO4	33.76	5.98	H2O	57.64	(NH4)2O	13.14	6.49	P2O5	24.45	4.43	C
0	NH3	6.32	5.57	H3PO4	27.02	4.14	H2O	66.66	(NH4)2O	9.67	4.36	P2O5	19.59	3.24	"
0	NH3	3.89	2.98	H3PO4	19.37	2.58	H2O	76.74	(NH4)2O	5.95	2.45	P2O5	14.03	2.12	"
0	NH3	3.52	2.63	H3PO4	17.98	2.34	H2O	78.50	(NH4)2O	5.38	2.19	P2O5	13.02	1.94	"
0	NH3	3.07	2.25	H3PO4	16.65	2.12	H2O	80.28	(NH4)2O	4.69	1.88	P2O5	12.03	1.76	"
0	NH3	2.85	2.13	H3PO4	18.69	2.43	H2O	78.46	(NH4)2O	4.35	1.76	P2O5	13.52	2.01	"
0	NH3	2.90	2.24	H3PO4	21.19	2.85	H2O	75.91	(NH4)2O	4.43	1.83	P2O5	15.34	2.32	"
0	NH3	3.00	2.42	H3PO4	24.25	3.40	H2O	72.75	(NH4)2O	4.59	1.94	P2O5	17.57	2.73	"
0	NH3	3.52	5.99	H3PO4	61.96	18.32	H2O	34.52	(NH4)2O	5.38	3.24	P2O5	44.90	9.94	"
0	NH3	3.50	7.60	H3PO4	69.46	26.21	H2O	27.04	(NH4)2O	5.35	3.52	P2O5	50.27	12.10	C + D
0	NH3	3.54	8.19	H3PO4	71.09	28.59	H2O	25.37	(NH4)2O	5.41	3.64	P2O5	51.50	12.69	D
0	NH3	3.25	7.65	H3PO4	71.80	29.36	H2O	24.95	(NH4)2O	4.97	3.35	P2O5	52.00	12.85	"
0	NH3	2.70	6.97	H3PO4	74.54	33.42	H2O	22.76	(NH4)2O	4.13	2.85	P2O5	54.00	13.62	D
0	NH3	2.96	8.67	H3PO4	77.00	39.21	H2O	20.04	(NH4)2O	4.52	3.24	P2O5	55.80	14.65	"
0	NH3	2.82	9.22	H3PO4	79.22	45.01	H2O	17.96	(NH4)2O	4.31	3.17	P2O5	57.35	15.44	"
0	NH3	3.40	15.76	H3PO4	83.93	67.59	H2O	12.67	(NH4)2O	5.20	4.14	P2O5	60.75	17.68	"
0	NH3	3.52	17.33	H3PO4	84.55	72.32	H2O	11.93	(NH4)2O	5.38	4.33	P2O5	61.25	18.06	E
0	NH3	2.92	15.99	H3PO4	86.36	82.20	H2O	10.72	(NH4)2O	4.46	3.63	P2O5	62.50	18.65	F
0	NH3	1.71	6.54	H3PO4	82.93	55.09	H2O	15.36	(NH4)2O	2.61	1.97	P2O5	60.06	16.59	"
25	NH3	4.31	4.11	H3PO4	34.09	5.65	H2O	61.60	(NH4)2O	6.59	3.08	P2O5	24.69	4.22	C
25	NH3	4.25	3.64	H3PO4	27.20	4.05	H2O	68.55	(NH4)2O	6.50	2.86	P2O5	19.70	3.18	"
25	NH3	4.18	3.47	H3PO4	25.09	3.62	H2O	70.73	(NH4)2O	6.59	2.77	P2O5	18.18	2.89	"
25	NH3	4.34	3.58	H3PO4	24.46	3.51	H2O	71.20	(NH4)2O	6.64	2.87	P2O5	17.72	2.80	"
25	NH3	4.48	3.73	H3PO4	24.92	3.60	H2O	70.60	(NH4)2O	6.85	2.95	P2O5	18.05	2.87	"
25	NH3	2.93	2.42	H3PO4	25.94	3.72	H2O	71.13	(NH4)2O	7.54	3.32	P2O5	18.79	3.03	"
25	NH3	8.55	9.14	H3PO4	36.50	6.78	H2O	54.95	(NH4)2O	13.05	6.62	P2O5	26.44	4.91	"
25	NH3	5.22	22.91	H3PO4	81.40	62.08	H2O	13.38	(NH4)2O	7.98	6.38	P2O5	58.96	17.27	C + E
25	NH3	3.27	20.67	H3PO4	87.44	96.04	H2O	9.29	(NH4)2O	5.00	4.17	P2O5	63.33	19.40	E
25	NH3	2.90	20.84	H3PO4	88.93	111.1	H2O	8.17	(NH4)2O	4.43	3.74	P2O5	64.41	20.11	"
50	NH3	12.26	8.50	H3PO4	3.01	0.362	H2O	84.73	(NH4)2O	18.76	7.56	P2O5	2.18	0.32	A
50	NH3	9.35	6.71	H3PO4	8.80	1.10	H2O	81.85	(NH4)2O	14.31	5.82	P2O5	6.38	0.95	"
50	NH3	8.97	6.85	H3PO4	14.10	1.87	H2O	76.93	(NH4)2O	13.72	5.78	P2O5	10.21	1.58	"
50	NH3	9.33	7.54	H3PO4	18.05	2.54	H2O	72.62	(NH4)2O	14.27	6.23	P2O5	13.08	2.09	"
50	NH3	11.18	10.98	H3PO4	29.02	4.95	H2O	59.80	(NH4)2O	17.11	8.40	P2O5	21.02	3.79	"
50	NH3	11.49	11.72	H3PO4	30.96	5.49	H2O	57.55	(NH4)2O	17.58	8.83	P2O5	22.43	4.13	A + B
50	NH3	12.20	13.34	H3PO4	34.10	6.48	H2O	53.70	(NH4)2O	28.67	9.75	P2O5	24.70	4.73	B
50	NH3	12.03	13.26	H3PO4	34.71	6.65	H2O	53.26	(NH4)2O	18.41	9.65	P2O5	25.14	4.83	"
50	NH3	12.00	13.25	H3PO4	34.81	6.68	H2O	53.19	(NH4)2O	18.36	9.61	P2O5	25.22	4.85	"
50	NH3	12.03	13.47	H3PO4	35.52	6.91	H2O	52.45	(NH4)2O	18.41	9.73	P2O5	25.73	4.98	"
50	NH3	12.07	13.67	H3PO4	36.07	7.10	H2O	51.86	(NH4)2O	18.47	9.82	P2O5	26.13	5.09	"
50	NH3	12.28	14.70	H3PO4	38.67	8.04	H2O	49.05	(NH4)2O	18.79	10.41	P2O5	28.01	5.70	"
50	NH3	12.64	16.49	H3PO4	42.35	9.60	H2O	45.01	(NH4)2O	19.34	11.05	P2O5	30.68	6.43	"
50	NH3	13.88	24.76	H3PO4	53.20	16.49	H2O	32.92	(NH4)2O	21.24	14.01	P2O5	38.54	9.32	B + C
50	NH3	8.50	9.77	H3PO4	40.42	8.07	H2O	51.08	(NH4)2O	13.00	6.81	P2O5	29.28	5.63	C
50	NH3	6.68	6.80	H3PO4	35.63	6.30	H2O	57.69	(NH4)2O	10.22	4.99	P2O5	25.81	4.63	"
50	NH3	6.10	6.04	H3PO4	34.58	5.95	H2O	59.32	(NH4)2O	9.33	4.48	P2O5	25.05	4.41	"
50	NH3	5.84	5.85	H3PO4	35.51	6.18	H2O	58.65	(NH4)2O	8.94	4.31	P2O5	25.78	4.55	"
50	NH3	5.77	6.47	H3PO4	41.88	8.16	H2O	52.35	(NH4)2O	8.82	4.50	P2O5	30.34	5.68	"
50	NH3	5.68	8.43	H3PO4	54.77	14.13	H2O	39.55	(NH4)2O	8.68	5.03	P2O5	39.68	8.43	"
50	NH3	5.97	15.86	H3PO4	71.92	33.19	H2O	22.11	(NH4)2O	9.13	6.50	P2O5	52.09	13.62	"
50	NH3	6.48	36.27	H3PO4	83.03	80.77	H2O	10.49	(NH4)2O	9.91	8.36	P2O5	60.14	18.60	"
50	NH3	6.44	45.95	H3PO4	85.33	105.8	H2O	8.23	(NH4)2O	9.85	8.60	P2O5	61.80	19.80	"
50	NH3	5.88	56.98	H3PO4	88.06	148.3	H2O	6.06	(NH4)2O	8.99	8.09	P2O5	63.78	21.07	B + C
50	NH3	13.81	24.71	H3PO4	53.37	16.59	H2O	32.82	(NH4)2O	--		P2O5	-	--	E

Notes:
   Table 1  ^a  These values were calculated by the compiler.
   Table 1  ^b  The solid phases are: A=(NH₄)₃PO₄·3H₂O; B=(NH₄)₂HPO₄; C=NH₄H₂PO₄; D=NH₄H₅PO₄)₂·H₂:O E=NH₄H₅(PO₄)₂; F=2H₃PO₄·H₂O.
   Table 1  ^c  These data appear only in source paper 2.

Method/Apparatus/Procedure:
   The isothermal method was used. The composition of the solid phases was determined microscopically and with the use of the Schreinemakers method.

Source and Purity of Materials:
   Chemically pure ammonia and analytical reagent grade H₃PO₄ were used. The materials were purified by repeated freezing.

Estimated Errors:

   Temperature: The temperature was kept constant within 0.05 K.