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., Izv. Vissh. Ucheb. Zaved., Khim. Khim. Tekhnol. 8, 883 (1965).

Variables:

   Concentration = Composition at 15 ºC.

Prepared By:
   J. Eysseltová

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

Supersaturation in the NH4H2PO4--NH4NO3--KCl--H2O system at 15 C Part 1. The author's data:
Solution number	Chemical₁	10² * Mass Fraction w₁	Chemical₂	10² * Mass Fraction w₂	Chemical₃	10² * Mass Fraction w₃	Solid Phase(s)^(c)	Comment(s)
1	NH4NO3	41 (b)	NH4H2PO4	41 (b)	KCl	18 (b)	A	(a) Total solute value (100 w=32) Total nutrition: 59.93 solute, 17.9 solution
2	NH4NO3	17 (b)	NH4H2PO4	17 (b)	KCl	66 (b)	B	(a) Total solute value (100 w=32) Total nutrition: 60.12 solute, 19.25 solution
3	NH4NO3	28.8 (b)	NH4H2PO4	46.2 (b)	KCl	25 (b)	A	(a) Total solute value (100 w=32) Total nutrition: 59.93 solute, 19.1 solution
4	NH4NO3	24.2 (b)	NH4H2PO4	38.8 (b)	KCl	37 (b)	B	(a) Total solute value (100 w=32) Total nutrition: 60.46 solute, 19.3 solution
5	NH4NO3	19.2 (b)	NH4H2PO4	50.8 (b)	KCl	30 (b)	A+B	(a) Total solute value (100 w=32) Total nutrition: 63.11 solute, 20.2 solution
6	NH4NO3	33.8 (b)	NH4H2PO4	54.2 (b)	KCl	12 (b)	A	(a) Total solute value (100 w=30) Total nutrition: 59.51 solute, 17.85 solution
7	NH4NO3	17.3 (b)	NH4H2PO4	27.7 (b)	KCl	55 (b)	C	(a) Total solute value (100 w=30) Total nutrition: 61.18 solute, 18.35 solution
8	NH4NO3	23.8 (b)	NH4H2PO4	63.2 (b)	KCl	13 (b)	A	(a) Total solute value (100 w=30) Total nutrition: 63.23 solute, 18.95 solution
9	NH4NO3	15.9 (b)	NH4H2PO4	42.1 (b)	KCl	42 (b)	C	(a) Total solute value (100 w=30) Total nutrition: 63.10 solute, 18.93 solution
10	NH4NO3	35 (b)	NH4H2PO4	56 (b)	KCl	9 (b)	A	(a) Total solute value (100 w=28) Total nutrition: 58.29 solute, 16.30 solution
11	NH4NO3	7.7 (b)	NH4H2PO4	12.3 (b)	KCl	80 (b)	C	(a) Total solute value (100 w=28) Total nutrition: 62.18 solute, 17.4 solution
12	NH4NO3	27.25 (b)	NH4H2PO4	72.25 (b)	KCl	0.5 (b)	A	(a) Total solute value (100 w=28) Total nutrition: 63.17 solute, 17.7 solution
13	NH4NO3	13.7 (b)	NH4H2PO4	36.3 (b)	KCl	50 (b)	C	(a) Total solute value (100 w=28) Total nutrition: 63.13 solute, 17.65 solution

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	13.1	2.41	NH4H2PO4	13.1	1.68	KCl	5.8	1.1	H2O	68
2	NH4NO3	5.4	1.0	NH4H2PO4	5.4	0.70	KCl	21.1	4.2	H2O	68
3	NH4NO3	9.2	1.7	NH4H2PO4	14.8	1.89	KCl	8.0	1.7	H2O	68
4	NH4NO3	7.7	1.4	NH4H2PO4	12.4	1.59	KCl	11.8	2.33	H2O	68
5	NH4NO3	6.1	1.1	NH4H2PO4	16.3	2.08	KCl	9.6	1.9	H2O	68
6	NH4NO3	10.1	1.81	NH4H2PO4	16.3	2.02	KCl	3.6	0.69	H2O	70
7	NH4NO3	5.2	0.93	NH4H2PO4	8.3	1.0	KCl	16.5	3.16	H2O	70
8	NH4NO3	7.1	1.3	NH4H2PO4	19.0	2.35	KCl	3.9	0.75	H2O	70
9	NH4NO3	4.8	0.85	NH4H2PO4	12.6	1.57	KCl	12.6	2.41	H2O	70
10	NH4NO3	9.8	1.7	NH4H2PO4	15.7	1.89	KCl	2.5	0.47	H2O	72
11	NH4NO3	2.2	0.37	NH4H2PO4	3.4	0.42	KCl	22.4	4.17	H2O	72
12	NH4NO3	7.6	1.3	NH4H2PO4	20.2	2.44	KCl	0.1	0.03	H2O	72
13	NH4NO3	3.8	0.67	NH4H2PO4	10.2	1.23	KCl	14.0	2.61	H2O	72

Notes:
   Table 1  ^a  This is the total solute 100w_i value.
   Table 1  ^b  The composition unit is: 100w_i of solute.
   Table 1  ^c  The solid phases are: A=NH₄H₂PO₄; B=KNO₃; C=KH₂PO₄.

Method/Apparatus/Procedure:
   Mixtures of dry salts and water were stirred vigorously (900 to 1200 rpm) and heated 1 °C to 2 °C above the temperature at which the last crystal disappeared. The solution was then cooled at the rate of 1 to 2 deg/hr and the temperature at which the last crystal disappeared was observed. The supersaturation isotherms were constructed graphically.

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

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