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.; Dagon, R., Helv. Chim. Acta 1961, 44, 2173.

Variables:

   Concentration = Composition at 0 ºC and 50 ºC

Prepared By:
   J. Eysseltová

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

Part 1. Composition of saturated solutions of the NH₄⁺-H⁺-PO₄^3—H₂O system.
t/°C	Chemical₁	Mass Fraction w₁^{ion %}	Chemical₂	Mass Fraction w₂^{ion %}	Chemical₃	Mole Fraction₃^(a)	Chemical₄	10² * Mass Fraction w₄	m₄ [mol/kg]	Chemical₅	10² * Mass Fraction w₅	m₅ [mol/kg]	Chemical₆	10² * Mass Fraction w₆^(b)	Solid Phase(s)^(c)
0	NH4+	100.0	H+	0.0	H2O	3900	NH3 (b)	2.26	1.42	H3PO4 (b)	4.34	0.47	H2O	93.4	A
0	NH4+	69.1	H+	30.9	H2O	1130	NH3 (b)	4.74	3.39	H3PO4 (b)	13.2	1.64	H2O	82.1	A
0	NH4+	68.2	H+	31.8	H2O	849	NH3 (b)	5.89	4.46	H3PO4 (b)	16.6	2.18	H2O	77.5	A
0	NH4+	67.2	H+	32.8	H2O	589	NH3 (b)	7.62	6.33	H3PO4 (b)	21.7	3.14	H2O	70.6	A
0	NH4+	67.3	H+	32.7	H2O	432	NH3 (b)	9.40	8.65	H3PO4 (b)	26.8	4.28	H2O	63.8	A + B
0	NH4+	66.8	H+	33.2	H2O	432	NH3 (b)	9.33	8.58	H3PO4 (b)	26.8	4.28	H2O	63.9	A + B
0	NH4+	62.4	H+	37.6	H2O	374	NH3 (b)	9.60	9.26	H3PO4 (b)	29.5	4.95	H2O	60.9	B
0	NH4+	55.8	H+	44.2	H2O	267	NH3 (b)	10.5	11.6	H3PO4 (b)	36.2	6.93	H2O	53.3	B
0	NH4+	54.2	H+	45.8	H2O	241	NH3 (b)	10.8	12.5	H3PO4 (b)	38.3	7.68	H2O	50.9	B
0	NH4+	52.4	H+	47.6	H2O	210	NH3 (b)	11.2	13.8	H3PO4 (b)	41.1	8.81	H2O	47.6	B
0	NH4+	51.9	H+	48.1	H2O	212	NH3 (b)	11.1	13.6	H3PO4 (b)	41.0	8.73	H2O	47.9	B + C
0	NH4+	31.9	H+	68.1	H2O	211	NH3 (b)	7.14	8.39	H3PO4 (b)	42.9	8.77	H2O	50.0	B + C
0	NH4+	44.1	H+	55.9	H2O	462	NH3 (b)	6.08	5.30	H3PO4 (b)	26.5	4.00	H2O	67.4	C
0	NH4+	39.8	H+	60.2	H2O	656	NH3 (b)	4.30	3.37	H3PO4 (b)	20.7	2.82	H2O	75.0	C
0	NH4+	33.2	H+	66.8	H2O	924	NH3 (b)	2.76	1.99	H3PO4 (b)	15.9	2.00	H2O	81.3	C
0	NH4+	33.1	H+	66.9	H2O	920	NH3 (b)	2.76	2.00	H3PO4 (b)	16.0	2.01	H2O	81.2	C
0	NH4+	29.7	H+	70.3	H2O	799	NH3 (b)	2.78	2.06	H3PO4 (b)	18.0	2.32	H2O	79.2	C
0	NH4+	21.8	H+	78.2	H2O	483	NH3 (b)	3.01	2.50	H3PO4 (b)	26.5	3.83	H2O	70.5	C
0	NH4+	14.4	H+	85.6	H2O	213	NH3 (b)	3.34	3.75	H3PO4 (b)	44.4	8.68	H2O	52.2	C
0	NH4+	11.1	H+	88.9	H2O	77.2	NH3 (b)	3.90	7.98	H3PO4 (b)	67.4	24.0	H2O	28.7	C + D
0	NH4+	11.1	H+	88.9	H2O	75.9	NH3 (b)	3.92	8.12	H3PO4 (b)	67.7	24.4	H2O	28.4	C + D
0	NH4+	8.7	H+	91.3	H2O	66.3	NH3 (b)	3.21	7.28	H3PO4 (b)	70.9	27.9	H2O	25.9	D
0	NH4+	7.8	H+	92.2	H2O	57.8	NH3 (b)	2.99	7.49	H3PO4 (b)	73.6	32.0	H2O	23.4	D
0	NH4+	7.2	H+	92.8	H2O	43.8	NH3 (b)	2.93	9.12	H3PO4 (b)	78.2	42.2	H2O	18.9	D
0	NH4+	7.3	H+	92.7	H2O	34.2	NH3 (b)	3.10	11.8	H3PO4 (b)	81.5	54.1	H2O	15.4	D
0	NH4+	7.3	H+	92.7	H2O	33.0	NH3 (b)	3.12	12.3	H3PO4 (b)	82.0	56.0	H2O	14.9	D
0	NH4+	7.7	H+	92.3	H2O	25.8	NH3 (b)	3.39	16.6	H3PO4 (b)	84.6	71.7	H2O	12.0	D + E
0	NH4+	7.3	H+	92.7	H2O	20.1	NH3 (b)	3.31	20.2	H3PO4 (b)	87.0	92.0	H2O	9.65	E
0	NH4+	7.5	H+	92.5	H2O	10.6	NH3 (b)	3.56	39.3	H3PO4 (b)	91.1	174	H2O	5.33	E
0	NH4+	6.1	H+	93.9	H2O	24.1	NH3 (b)	2.73	14.1	H3PO4 (b)	85.9	76.8	H2O	11.4	F
0	NH4+	5.1	H+	94.9	H2O	29.2	NH3 (b)	2.24	9.7	H3PO4 (b)	84.2	63.4	H2O	13.6	F
0	NH4+	3.8	H+	96.2	H2O	34.6	NH3 (b)	1.64	6.1	H3PO4 (b)	82.6	53.5	H2O	15.8	F
0	NH4+	2.2	H+	97.8	H2O	40.7	NH3 (b)	0.93	3.0	H3PO4 (b)	80.9	45.4	H2O	18.2	F
0	NH4+	0.0	H+	100.0	H2O	48.7	NH3 (b)	0.00	0.0	H3PO4 (b)	78.8	38.0	H2O	21.2	F
0	NH4+	0.0	H+	100.0	H2O	48.2	NH3 (b)	0.00	0.0	H3PO4 (b)	79.0	38.4	H2O	21.0	F
50	NH4+	31.5	H+	68.5	H2O	302	NH3 (b)	5.80	5.79	H3PO4 (b)	35.3	6.13	H2O	58.9	C
50	NH4+	29.6	H+	70.4	H2O	277	NH3 (b)	5.75	5.93	H3PO4 (b)	37.3	6.68	H2O	57.0	C
50	NH4+	24.4	H+	75.6	H2O	200	NH3 (b)	5.70	6.77	H3PO4 (b)	44.8	9.25	H2O	49.5	C
50	NH4+	20.8	H+	79.2	H2O	146	NH3 (b)	5.67	7.91	H3PO4 (b)	52.2	12.6	H2O	42.1	C
50	NH4+	17.6	H+	82.4	H2O	95.9	NH3 (b)	5.66	10.2	H3PO4 (b)	61.7	19.3	H2O	32.6	C
50	NH4+	16.2	H+	83.8	H2O	73.5	NH3 (b)	5.67	12.2	H3PO4 (b)	67.1	25.2	H2O	27.2	C
50	NH4+	15.1	H+	84.9	H2O	50.1	NH3 (b)	5.81	16.7	H3PO4 (b)	73.8	36.9	H2O	20.4	C
50	NH4+	14.5	H+	85.5	H2O	29.7	NH3 (b)	6.10	27.1	H3PO4 (b)	80.7	62.3	H2O	13.2	C

Part 2. Composition of solutions saturated simultaneously with NH₄H₂PO₄ and (NH₄)₂HPO₄.
t/°C	Chemical₁	Composition₁ [g/100 g H2O]^(a)	Chemical₂	Composition₂ [g/100 g H2O]^(a)	Chemical₃	10² * Mass Fraction w₃	m₃ [mol/kg]	Chemical₄	10² * Mass Fraction w₄	m₄ [mol/kg]	Chemical₅	10² * Mass Fraction w₅
0	NH4H2PO4	23.0	(NH4)2HPO4	57.1	NH3 (b)	10.1	10.6	H3PO4 (b)	34.4	6.32	H2O (b)	55.5
25	NH4H2PO4	41.4	(NH4)2HPO4	70.2	NH3 (b)	11.5	14.2	H3PO4 (b)	41.3	8.91	H2O (b)	47.3
50	NH4H2PO4	68.3	(NH4)2HPO4	87.8	NH3 (b)	12.8	19.2	H3PO4 (b)	48.2	12.6	H2O (b)	39.0

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)₃PO₄; B=(NH₄)₂HPO₄; C=NH₄H₂PO₄; D=NH₄H₅(PO₄)₂·H₂O; E=NH₄H₅(PO₄)₂; F=H₃PO₄·0.5H₂O.
   Table 2  ^a  The composition unit is: g/100g H₂O
   Table 2  ^b  These values were calculated by the compiler.

Method/Apparatus/Procedure:
   No information is given.

Source and Purity of Materials:
   No information is given.

Estimated Errors:

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