IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Ammonium dihydrogenphosphate with Potassium chloride and Water

Components:
   (1) Ammonium dihydrogenphosphate; NH4H2PO4; [7722-76-1]  NIST Chemistry WebBook for detail
   (2) Potassium chloride; KCl; [7747-40-7]  NIST Chemistry WebBook for detail
   (3) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Fokina, Z.N.; Kornishina, E.N.; Kim, P.P., Tekhnologiya Mineral'nykh Udobreniy (Leningrad) 63 (1977).

Variables:

   Concentration = Composition at 60 ºC.

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

Experimental Data:   (Notes on the Nomenclature)

Solubility isotherms in the NH₄H₂PO₄-KH₂PO₄-NH₄Cl-KCl-H₂O system.
Solution number	Chemical₁	10² * Mass Fraction w₁	Chemical₂	10² * Mass Fraction w₂	Chemical₃	10² * Mass Fraction w₃	Solid Phase(s)
1	K2O	1.6	NH3	6.5	P2O5	26.6	NH4H2PO4
2	K2O	3.7	NH3	5.9	P2O5	24.1	(K,NH4)H2PO4
3	K2O	6.1	NH3	4.2	P2O5	16.9	(K,NH4)H2PO4
4	K2O	7.9	NH3	3.9	P2O5	15.9	(K,NH4)H2PO4
5	K2O	9.8	NH3	3.5	P2O5	14.6	(K,NH4)H2PO4
6	K2O	10.5	NH3	3.2	P2O5	13.1	KH2PO4
7	K2O	11.0	NH3	3.0	P2O5	12.2	KH2PO4
8	K2O	11.3	NH3	2.4	P2O5	11.0	KH2PO4
9	K2O	16.4	NH3	0.9	P2O5	3.7	KH2PO4
10	K2O	17.5	NH3	0.7	P2O5	3.0	KH2PO4
11	K2O	20.2	NH3	0.4	P2O5	1.7	KH2PO4

The compilers have recalculated the authors’ data to give the following values
Solution number	Chemical₁	10² * Mass Fraction w₁	m₁	Chemical₂	10² * Mass Fraction w₂	m₂	Chemical₃	10² * Mass Fraction w₃	m₃	Chemical₄	10² * Mass Fraction w₄	m₄	Chemical₅	10² * Mass Fraction w₅
1	H2PO4-	36.0	0.375	chloride	1.5	0.043	potassium	1.3	0.034	ammonium	6.9	0.38	H2O	55.8
2	H2PO4-	32.6	0.340	chloride	3.0	0.086	potassium	3.1	0.079	ammonium	6.2	0.35	H2O	58.1
3	H2PO4-	22.9	0.230	chloride	4.9	0.14	potassium	5.1	0.13	ammonium	4.4	0.25	H2O	67.6
4	H2PO4-	21.5	0.224	chloride	6.1	0.17	potassium	6.6	0.17	ammonium	4.1	0.23	H2O	67.8
5	H2PO4-	19.8	0.206	chloride	7.3	0.21	potassium	8.1	0.21	ammonium	3.7	0.21	H2O	68.4
6	H2PO4-	17.7	0.185	chloride	8.0	0.23	potassium	8.7	0.22	ammonium	3.4	0.19	H2O	70.2
7	H2PO4-	16.5	0.172	chloride	8.4	0.24	potassium	9.1	0.23	ammonium	3.2	0.18	H2O	71.2
8	H2PO4-	14.9	0.155	chloride	7.9	0.23	potassium	9.4	0.24	ammonium	2.5	0.14	H2O	73.2
9	H2PO4-	5.0	0.052	chloride	12.2	0.349	potassium	13.6	0.340	ammonium	0.95	0.053	H2O	80.4
10	H2PO4-	4.1	0.042	chloride	13.0	0.370	potassium	14.5	0.372	ammonium	0.74	0.041	H2O	80.7
11	H2PO4-	2.3	0.024	chloride	15.0	0.420	potassium	16.8	0.429	ammonium	0.42	0.024	H2O	80.5

Method/Apparatus/Procedure:
   No information is given. The compilers assume that the methods were the same as those given earlier.¹

Source and Purity of Materials:
   No information is given.

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

References:
   ¹T. N. Baranova, N. T. Semkin, P. P. Kim, E. N. Kornishina, and I. S. Nikandrov, Tekhnologiya Mineral'nykh Udobreniy (Leningrad), 55 (1977).