IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Ammonium dihydrogenphosphate with Ammonium nitrate, Ammonium chloride, Potassium dihydrogenphosphate, Potassium nitrate, Potassium chloride and Water

Components:
   (1) Ammonium chloride; NH4Cl; [12125-02-9]  NIST Chemistry WebBook for detail
   (2) Ammonium dihydrogenphosphate; NH4H2PO4; [7722-76-1]  NIST Chemistry WebBook for detail
   (3) Ammonium nitrate; NH4NO3; [6484-52-2]  NIST Chemistry WebBook for detail
   (4) Potassium chloride; KCl; [7747-40-7]  NIST Chemistry WebBook for detail
   (5) Potassium dihydrogenphosphate; KH2PO4; [7778-77-0]  NIST Chemistry WebBook for detail
   (6) Potassium nitrate; KNO3; [7757-79-1]  NIST Chemistry WebBook for detail
   (7) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Pozin, M.E.; Kopylev, B.A.; Shilling, N.A., Zh. Prikl. Khim. (Leningrad) 37, 2341 (1964).

Variables:

   Concentration = Composition at 15 ºC and 25 ºC.

Prepared By:
   J. Eysseltová

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

Solubility in the NH₄H₂PO₄-NH₄NO₃-H₂O system.
Solution number	t/°C	Chemical₁	10² * Mass Fraction w₁	Chemical₂	Composition₂^(a)	Chemical₃	Composition₃^(a)	Chemical₄	Composition₄^(a)	Chemical₅	Composition₅^(a)	Chemical₆	Composition₆^(a)	Chemical₇	Composition_7/sub>^(a)
1	15	solute	32	NH4NO3	34.00	NH4H2PO4	17.00	KCl	49.00	N	25.30	P2O5	19.00	K2O	55.70
2	15	solute	32	NH4NO3	52.35	NH4H2PO4	26.15	KCl	21.50	N	42.00	P2O5	31.50	K2O	26.50
3	15	solute	30	NH4NO3	62.00	NH4H2PO4	31.00	KCl	7.00	N	51.00	P2O5	38.00	K2O	11.00
4	15	solute	30	NH4NO3	42.80	NH4H2PO4	34.20	KCl	23.00	N	35.00	P2O5	38.50	K2O	26.50
5	15	solute	30	NH4NO3	35.00	NH4H2PO4	35.00	KCl	30.00	N	29.00	P2O5	37.90	K2O	33.10
6	15	solute	30	NH4NO3	28.25	NH4H2PO4	28.25	KCl	43.50	N	22.90	P2O5	30.00	K2O	47.10
7	15	solute	30	NH4NO3	30.55	NH4H2PO4	24.45	KCl	45.00	N	23.80	P2O5	26.40	K2O	49.80
8	15	solute	28	NH4NO3	49.70	NH4H2PO4	39.80	KCl	10.50	N	41.65	P2O5	45.95	K2O	12.50
9	15	solute	28	NH4NO3	41.75	NH4H2PO4	51.75	KCl	16.50	N	35.30	P2O5	46.10	K2O	18.60
10	15	solute	28	NH4NO3	27.85	NH4H2PO4	44.65	KCl	27.50	N	25.40	P2O5	45.80	K2O	28.8
11	15	solute	28	NH4NO3	24.20	NH4H2PO4	38.80	KCl	37.00	N	22.00	P2O5	39.50	K2O	38.5
12	15	solute	28	NH4NO3	23.00	NH4H2PO4	23.00	KCl	54.00	N	18.40	P2O5	24.10	K2O	57.50
13	15	solute	28	NH4NO3	20.55	NH4H2PO4	16.45	KCl	63.00	N	16.50	P2O5	17.00	K2O	66.50
14	15	solute	28	NH4NO3	16.68	NH4H2PO4	13.32	KCl	70.00	N	12.50	P2O5	13.75	K2O	73.75
15	15	solute	28	NH4NO3	11.25	NH4H2PO4	11.25	KCl	77.50	N	8.70	P2O5	11.30	K2O	80.00
16	15	solute	25	NH4NO3	36.50	NH4H2PO4	58.50	KCl	5.00	N	31.20	P2O5	56.40	K2O	12.40
17	15	solute	25	NH4NO3	23.80	NH4H2PO4	63.20	KCl	13.00	N	25.50	P2O5	61.60	K2O	13.00
18	15	solute	25	NH4NO3	15.30	NH4H2PO4	40.70	KCl	44.00	N	16.10	P2O5	39.00	K2O	44.90
19	15	solute	25	NH4NO3	15.20	NH4H2PO4	24.30	KCl	60.50	N	13.50	P2O5	24.50	K2O	62.00
20	25	solute	34	NH4NO3	61.00	NH4H2PO4	30.50	KCl	8.50	N	51.0	P2O5	38.00	K2O	11.00
21	25	solute	34	NH4NO3	33.00	NH4H2PO4	33.00	KCl	34.00	N	27.15	P2O5	35.55	K2O	37.30
22	25	solute	34	NH4NO3	32.00	NH4H2PO4	32.00	KCl	36.00	N	26.25	P2O5	34.25	K2O	39.50
23	25	solute	34	NH4NO3	30.55	NH4H2PO4	24.75	KCl	44.50	N	24.05	P2O5	27.95	K2O	48.00
24	25	solute	32	NH4NO3	27.25	NH4H2PO4	37.75	KCl	25.00	N	39.20	P2O5	43.20	K2O	17.60
25	25	solute	32	NH4NO3	42.50	NH4H2PO4	42.50	KCl	15.00	N	36.00	P2O5	47.00	K2O	17.00
26	25	solute	32	NH4NO3	26.00	NH4H2PO4	41.50	KCl	32.50	N	24.05	P2O5	42.25	K2O	39.70
27	25	solute	32	NH4NO3	26.00	NH4H2PO4	26.00	KCl	48.00	N	21.00	P2O5	27.40	K2O	51.60
28	25	solute	32	NH4NO3	26.13	NH4H2PO4	20.85	KCl	53.00	N	20.20	P2O5	22.10	K2O	57.70
29	25	solute	30	NH4NO3	46.25	NH4H2PO4	46.25	KCl	7.50	N	39.66	P2O5	51.78	K2O	8.56
30	25	solute	30	NH4NO3	33.80	NH4H2PO4	54.20	KCl	12.00	N	31.00	P2O5	56.30	K2O	12.70
31	25	solute	30	NH4NO3	20.50	NH4H2PO4	54.25	KCl	25.00	N	21.70	P2O5	53.70	K2O	24.60
32	25	solute	30	NH4NO3	18.00	NH4H2PO4	48.00	KCl	34.00	N	19.20	P2O5	46.80	K2O	34.00
33	25	solute	30	NH4NO3	21.90	NH4H2PO4	35.10	KCl	43.00	N	19.70	P2O5	35.70	K2O	44.60
34	25	solute	30	NH4NO3	22.50	NH4H2PO4	22.50	KCl	50.00	N	18.00	P2O5	23.50	K2O	58.50
35	25	solute	28	NH4NO3	24.50	NH4H2PO4	65.00	KCl	10.50	N	26.00	P2O5	63.50	K2O	10.50
36	25	solute	28	NH4NO3	15.50	NH4H2PO4	41.50	KCl	43.00	N	16.60	P2O5	40.40	K2O	43.00
37	25	solute	28	NH4NO3	16.35	NH4H2PO4	26.15	KCl	57.50	N	14.50	P2O5	26.30	K2O	59.20

Part 2. The compiler has calculated the following solubility values from the data in Part 1.
Solution number	Chemical₁	10² * Mass Fraction w₁	m₁ [mol/kg]	Chemical₂	10² * Mass Fraction w₂	m₂ [mol/kg]	Chemical₃	10² * Mass Fraction w₃	m₃ [mol/kg]	Chemical₄	10² * Mass Fraction w₄
1	NH4NO3	10.88	2.00	NH4H2PO4	5.44	0.70	KCl	15.68	3.09	H2O	68.00
2	NH4NO3	16.75	3.08	NH4H2PO4	8.37	1.07	KCl	6.88	1.36	H2O	68.00
3	NH4NO3	18.60	3.32	NH4H2PO4	9.30	1.15	KCl	2.10	0.40	H2O	70.00
4	NH4NO3	12.84	2.29	NH4H2PO4	10.26	1.27	KCl	6.90	1.32	H2O	70.00
5	NH4NO3	10.50	1.87	NH4H2PO4	10.50	1.30	KCl	9.00	1.72	H2O	70.00
6	NH4NO3	8.48	1.51	NH4H2PO4	8.48	1.05	KCl	13.05	2.50	H2O	70.00
7	NH4NO3	9.17	1.64	NH4H2PO4	7.34	0.91	KCl	13.50	2.59	H2O	70.00
8	NH4NO3	13.92	2.41	NH4H2PO4	11.14	1.35	KCl	2.94	0.55	H2O	72.00
9	NH4NO3	11.69	2.03	NH4H2PO4	14.49	1.75	KCl	4.62	0.86	H2O	72.00
10	NH4NO3	7.80	1.35	NH4H2PO4	12.50	1.51	KCl	7.70	1.43	H2O	72.00
11	NH4NO3	6.78	1.18	NH4H2PO4	10.86	1.31	KCl	10.36	1.93	H2O	72.00
12	NH4NO3	6.44	1.12	NH4H2PO4	6.44	0.78	KCl	15.12	2.82	H2O	72.00
13	NH4NO3	5.75	1.00	NH4H2PO4	4.61	0.56	KCl	17.64	3.29	H2O	72.00
14	NH4NO3	4.67	0.81	NH4H2PO4	3.73	0.45	KCl	19.60	3.65	H2O	72.00
15	NH4NO3	3.15	0.55	NH4H2PO4	3.15	0.38	KCl	21.70	4.04	H2O	72.00
16	NH4NO3	9.13	1.52	NH4H2PO4	14.63	1.70	KCl	1.25	0.22	H2O	75.00
17	NH4NO3	5.95	0.99	NH4H2PO4	15.80	1.83	KCl	3.25	0.58	H2O	75.00
18	NH4NO3	3.83	0.64	NH4H2PO4	10.18	1.18	KCl	11.00	1.97	H2O	75.00
19	NH4NO3	3.80	0.63	NH4H2PO4	6.08	0.70	KCl	15.13	2.70	H2O	75.00
20	NH4NO3	20.74	3.93	NH4H2PO4	10.37	1.37	KCl	2.89	0.59	H2O	66.00
21	NH4NO3	11.22	2.12	NH4H2PO4	11.22	1.48	KCl	11.56	2.35	H2O	66.00
22	NH4NO3	10.88	2.06	NH4H2PO4	10.88	1.43	KCl	12.24	2.49	H2O	66.00
23	NH4NO3	10.39	1.97	NH4H2PO4	8.42	1.11	KCl	15.13	3.07	H2O	66.00
24	NH4NO3	8.72	1.60	NH4H2PO4	12.08	1.54	KCl	8.00	1.58	H2O	68.00
25	NH4NO3	13.60	2.50	NH4H2PO4	13.60	1.74	KCl	4.80	0.95	H2O	68.00
26	NH4NO3	8.32	1.53	NH4H2PO4	13.28	1.70	KCl	10.40	2.05	H2O	68.00
27	NH4NO3	8.32	1.53	NH4H2PO4	8.32	1.06	KCl	15.36	3.03	H2O	68.00
28	NH4NO3	8.36	1.54	NH4H2PO4	6.67	0.85	KCl	16.96	3.35	H2O	68.00
29	NH4NO3	13.88	2.48	NH4H2PO4	13.88	1.72	KCl	2.25	0.43	H2O	70.00
30	NH4NO3	10.14	1.81	NH4H2PO4	16.26	2.02	KCl	3.60	0.69	H2O	70.00
31	NH4NO3	6.15	1.10	NH4H2PO4	16.28	2.02	KCl	7.50	1.44	H2O	70.00
32	NH4NO3	5.40	0.96	NH4H2PO4	14.40	1.79	KCl	10.20	1.95	H2O	70.00
33	NH4NO3	6.57	1.17	NH4H2PO4	10.53	1.31	KCl	12.90	2.47	H2O	70.00
34	NH4NO3	6.75	1.20	NH4H2PO4	6.75	0.84	KCl	15.00	2.87	H2O	70.00
35	NH4NO3	6.86	1.19	NH4H2PO4	18.20	2.20	KCl	2.94	0.55	H2O	72.00
36	NH4NO3	4.34	0.75	NH4H2PO4	11.62	1.40	KCl	12.04	2.24	H2O	72.00
37	NH4NO3	4.58	0.79	NH4H2PO4	7.32	0.88	KCl	16.10	3.00	H2O	72.00

Notes:
   Table 1  ^a  The composition unit is g/100 g of solute.

Method/Apparatus/Procedure:
   A polythermic method was used.¹Because of the tendency for supersaturation, the temperature of disappearance of the last crystal was observed. The experiments were performed in 250 ml glass vessels. The solutions were stirred at 900 rpm to1200 rpm. The speed of heating was 1 deg/min. The compiler assumes that the isotherms were derived graphically from experimental results

Source and Purity of Materials:
   Chemically pure salts were recrystallized two or three times before use.

Estimated Errors:

   Temperature: The mean relative error of the experiments was specified as 1.6 %. The reproducibility of temperature measurements was 0.25 K.

References:
   ¹ A. G. Bergman and N. P. Luzhnaya, Fiziko-Khimicheskiye Osnovy Izucheniya i Ispol'zovaniya Solyanykh Mestorozhdeniy Khlorid-Sul'fatnogo Tipa, Moscow, IAN SSSR (1951).