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:
   Jänecke, E., Z. Phys. Chem. 1936, 177, 7.

Variables:

   Concentration = Composition and temperature

Prepared By:
   J. Eysseltová

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

Part I. The temperature at which the last crystal disappeared in the NH₃-H₃PO₄-H₂O-system.
t/°C	Chemical₁	10² * Mass Fraction w₁	Chemical₂	10² * Mass Fraction w₂	Chemical₃	m₃ [mol/kg]	Chemical₄	10² * Mass Fraction w₄	m₄ [mol/kg]	Solid Phase(s)
t1 = 90	NH3	6.50	H2O	35.0	NH3 (b)	10.9	H3PO4 (b)	58.5	17.1	NH4H5(PO4)2
t1 = 50, t2 = 48	NH3	5.90	H2O	3.0	NH3 (b)	115	H3PO4 (b)	91.1	310	NH4H5(PO4)2
t1 = 185, t2 = 184	NH3	11.3	H2O	2.2	NH3 (b)	302	H3PO4 (b)	86.5	401	NH4H2PO4
t1 = 126	NH3	8.50	H2O	30.0	NH3 (b)	16.6	H3PO4 (b)	61.5	20.9	NH4H2PO4
t1 = 88	NH3	6.50	H2O	30.0	NH3 (b)	12.7	H3PO4 (b)	63.5	21.6	NH4H2PO4
t1 = 93	NH3	11.0	H2O	35.0	NH3 (b)	18.5	H3PO4 (b)	54.0	15.7	NH4H2PO4
t1 = 85	NH3	8.50	H2O	35.0	NH3 (b)	14.3	H3PO4 (b)	56.5	16.5	NH4H2PO4
t1 = 88	NH3	10.0	H2O	40.0	NH3 (b)	14.7	H3PO4 (b)	50.0	12.8	NH4H2PO4
---	NH3	17.0	H2O	30.7	NH3 (b)	32.5	H3PO4 (b)	52.3	17.4	(NH4)2HPO4
t1 = 164	NH3	18.5	H2O	22.6	NH3 (b)	48.1	H3PO4 (b)	58.9	26.6	(NH4)2HPO4
t1 = >180	NH3	16.4	H2O	18.4	NH3 (b)	52.3	H3PO4 (b)	65.2	36.2	(NH4)2HPO4
t1 = 110	NH3	15.0	H2O	30.0	NH3 (b)	29.4	H3PO4 (b)	55.0	18.7	(NH4)2HPO4
t1 = 100?	NH3	12.5	H2O	30.0	NH3 (b)	24.5	H3PO4 (b)	57.5	19.6	(NH4)2HPO4
t1 = 72	NH3	13.5	H2O	35.0	NH3 (b)	22.6	H3PO4 (b)	51.5	15.0	(NH4)2HPO4
t1 = 58	NH3	13.2	H2O	41.8	NH3 (b)	18.5	H3PO4 (b)	45.0	11.0	(NH4)2HPO4
t1 = 53	NH3	12.5	H2O	40.0	NH3 (b)	18.3	H3PO4 (b)	47.5	12.1	(NH4)2HPO4
t1 = 185?	NH3	22.6	H2O	19.2	NH3 (b)	69.1	H3PO4 (b)	58.2	30.9	(NH4)3PO4K2H2O
t1 = 189, t2 = 185	NH3	21.5	H2O	22.3	NH3 (b)	56.6	H3PO4 (b)	56.2	25.7	(NH4)3PO4K2H2O
t1 = 147, t2 = 144	NH3	18.5	H2O	32.6	NH3 (b)	33.3	H3PO4 (b)	48.9	15.3	(NH4)3PO4K2H2O
t1 = 148, t2 = 148	NH3	18.7	H2O	36.6	NH3 (b)	30.2	H3PO4 (b)	45.0	12.6	(NH4)3PO4K2H2O
t1 = 149	NH3	19.1	H2O	41.1	NH3 (b)	27.3	H3PO4 (b)	39.8	9.88	(NH4)3PO4K2H2O
t1 = 124	NH3	16.7	H2O	40.9	NH3 (b)	24.0	H3PO4 (b)	42.4	10.6	(NH4)3PO4K2H2O
t1 = 115, t2 = 114	NH3	19.3	H2O	58.9	NH3 (b)	19.2	H3PO4 (b)	21.8	3.78	(NH4)3PO4K2H2O
t1 = 138	NH3	18.6	H2O	57.0	NH3 (b)	19.2	H3PO4 (b)	24.4	4.37	(NH4)3PO4K2H2O
t1 = 121, t2 = 121	NH3	27.0	H2O	17.1	NH3 (b)	92.7	H3PO4 (b)	55.9	33.4	(NH4)3PO4K2H2O
t1 = 117, t2 = 116	NH3	16.6	H2O	57.3	NH3 (b)	17.0	H3PO4 (b)	26.1	4.65	(NH4)3PO4K2H2O
t1 = 125?	NH3	16.5	H2O	51.4	NH3 (b)	18.8	H3PO4 (b)	32.1	6.37	(NH4)3PO4K2H2O
t1 = 114, t2 = 113	NH3	15.3	H2O	52.5	NH3 (b)	17.1	H3PO4 (b)	32.2	6.26	(NH4)3PO4K2H2O
t1 = 95	NH3	13.9	H2O	53.9	NH3 (b)	15.1	H3PO4 (b)	32.2	6.10	(NH4)3PO4K2H2O
t1 = 101, t2 = 100	NH3	17.8	H2O	69.6	NH3 (b)	15.0	H3PO4 (b)	12.6	1.85	(NH4)3PO4K2H2O

Part II. The characterization of the miscibility gap in the above solutions.
t/°C	Chemical₁	10² * Mass Fraction w₁	Chemical₂	10² * Mass Fraction w₂	m₂ [mol/kg]	Chemical₃	10² * Mass Fraction w₃	m₃ [mol/kg]	Chemical₄	Mass Ratio
t2 = 179, t3 = 194	NH3	24.9	H2O	18.5	79.0	NH3 (a)	56.6	31.2	H3PO4 (a)	---
t1 = 146, t2 = 175, t3 = 180	NH3	27.2	H2O	36.9	43.3	NH3 (a)	35.9	9.93	H3PO4 (a)	---
t3 = 195; 195	NH3	27.2	H2O	27.2	58.7	NH3 (a)	45.6	17.1	H3PO4 (a)	3:2
t1 = 138, t2 = 158, t3 = 183; 180	NH3	24.4	H2O	28.3	50.6	NH3 (a)	47.3	17.1	H3PO4 (a)	3:1
t1 = 160, t2 = 171, t3 = explosion	NH3	27.0	H2O	38.4	41.3	NH3 (a)	34.6	9.19	H3PO4 (a)	3:1
t1 = 125, t2 = 160, t3 = 170; 170, t4 = 148	NH3	25.6	H2O	38.1	39.5	NH3 (a)	36.3	9.72	H3PO4 (a)	5:2
t1 = 138, t2 = 165, t3 = 175, t4 = 157	NH3	24.0	H2O	36.4	38.7	NH3 (a)	39.6	11.1	H3PO4 (a)	3:1
t1 = 95, t2 = 142;140, t3 = 170; 167, t4 = 152	NH3	22.3	H2O	31.0	42.2	NH3 (a)	46.7	15.4	H3PO4 (a)	3:1
t1 = 122, t2 = 142, t3 = 164	NH3	22.0	H2O	31.9	40.5	NH3 (a)	46.1	14.7	H3PO4 (a)	1:3
t1 = 115, t2 = 155, t3 = 160, t4 = 125	NH3	21.8	H2O	32.6	39.3	NH3 (a)	45.6	14.3	H3PO4 (a)	3:1
t1 = 140, t2 = 147, t3 = 162, t4 = 110	NH3	22.8	H2O	41.3	32.4	NH3 (a)	35.9	8.87	H3PO4 (a)	5:2
t2 = 158, t3 = 164; 162, t4 = 148	NH3	23.5	H2O	45.5	30.3	NH3 (a)	31.0	6.95	H3PO4 (a)	4:1
t1 = 151, t2 = 145, t3 = 155; 152	NH3	20.2	H2O	51.2	23.2	NH3 (a)	28.6	5.70	H3PO4 (a)	2:1
t1 = 130, t2 = 149, t3 = 162	NH3	21.9	H2O	47.0	27.4	NH3 (a)	31.1	6.75	H3PO4 (a)	---
t1 = 80, t2 = 141, t3 = 144; 144, t4 = 105	NH3	20.9	H2O	54.5	22.5	NH3 (a)	24.6	4.61	H3PO4 (a)	---
t2 = 144, t3 = 147; 147, t4 = 138	NH3	20.5	H2O	60.3	20.0	NH3 (a)	19.2	3.25	H3PO4 (a)	1:1

Notes:
   Table 1  ^a  The meaning of t₁ and t₂ is not defined. The compiler's opinion is that these are the results of repeated measurements.
   Table 1  ^b  These values were calculated by the compiler.
   Table 2  ^a  These data were calculated by the compiler.
   Table 2  ^b  The meaning of the terms is as follows: t₁..The temperature at which one liquid phase was observed during heating. t₂..The temperature at which the other liquid phase appeared. t₃..The temperature at which the last crystal disappeared. t₄..The temperature at which the first crystal appeared during cooling. R..approximate ratio of the amount of upper layer in that of the lower layer.

Method/Apparatus/Procedure:
   The only information given is that a self-constructed apparatus was used.

Source and Purity of Materials:
   No information is given.

Estimated Errors:

   Temperature: No information is given. The compiler estimates the reproducibility of the temperature measurement to be about 2 °C.