IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Ammonium dihydrogenphosphate with Ammonium 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) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Volkov, A.A.; Sosnina, O.E., Uch. Zap. Perm. Univ. 1970, 229, 35.

Variables:

   Concentration = Composition at 0 ºC

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

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

Solubility in the NH₄H₂PO₄- NH₄Cl-H₂O system at 20 °C.
Chemical₁	10² * Mass Fraction w₁	m₁ [mol/kg]^(a)	Chemical₂	10² * Mass Fraction w₂	m₂ [mol/kg]^(a)	Chemical₃	10² * Mass Fraction w₃	Solid Phase(s)	Refractive Index
NH4H2PO4	27.2	3.25	NH4Cl	0	0	H2O	72.80	NH4H2PO4	1.3700
NH4H2PO4	21.0	2.45	NH4Cl	4.50	1.13	H2O	74.50	NH4H2PO4	1.3695
NH4H2PO4	16.0	1.85	NH4Cl	8.75	2.17	H2O	75.25	NH4H2PO4	1.3715
NH4H2PO4	11.50	1.333	NH4Cl	13.50	3.364	H2O	75.00	NH4H2PO4	1.3740
NH4H2PO4	8.00	0.946	NH4Cl	18.50	4.705	H2O	73.50	NH4H2PO4	1.3790
NH4H2PO4	5.55	0.680	NH4Cl	23.50	6.191	H2O	70.95	NH4H2PO4	1.3865
NH4H2PO4	4.50	0.556	NH4Cl	25.10	6.664	H2O	70.40	NH4H2PO4 + NH4Cl	1.3890
NH4H2PO4	4.25	0.528	NH4Cl	25.75	6.876	H2O	70.00	NH4Cl	1.3875
NH4H2PO4	0	0	NH4Cl	27.10	6.948	H2O	72.90	NH4Cl	1.3860

Notes:
   Table 1  ^a  These values were calculated by the compiler. The unit is: mol kg^–1.

Method/Apparatus/Procedure:
   The isothermal method of sections (1, 2) was used with the aid of refractive index measurements.

Source and Purity of Materials:
   Chemically pure NH₄Cl and reagent grade NH₄H₂PO₄ were used.

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

References:
   ¹Merclin, R.V. Izv. biolog. n.-i. in-ta pri Permsk. Un-te. 1937, 11, 1.
   ²Zhuravlev, E.F.; Sheveleva, A.D. Zh. Neorg. Khim. 1960, 5, 2360.
   ³Karyakin, Yu.V. Chistye Khimicheskie Reaktivy, p. 58, Moscow, 1947.