IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Triammonium phosphate with Ammonium chloride and Water

Components:
   (1) Ammonium chloride; NH4Cl; [12125-02-9]  NIST Chemistry WebBook for detail
   (2) Triammonium phosphate; (NH4)3PO4; [10361-65-6]  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 20 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 NH₄Cl-(NH₄)₃PO₄-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)^(b)	Refractive Index
NH4Cl	0	0	(NH4)3PO4	12.80	0.9979	H2O	87.20	A	1.3580
NH4Cl	4.50	0.981	(NH4)3PO4	9.80	0.777	H2O	85.70	A	1.3620
NH4Cl	9.11	2.08	(NH4)3PO4	8.90	0.738	H2O	81.99	A	1.3680
NH4Cl	13.80	3.294	(NH4)3PO4	7.90	0.686	H2O	78.30	A	1.3750
NH4Cl	18.50	4.676	(NH4)3PO4	7.55	0.694	H2O	73.95	A	1.3820
NH4Cl	21.30	5.568	(NH4)3PO4	7.20	0.685	H2O	71.50	A	1.3860
NH4Cl	24.10	6.557	(NH4)3PO4	7.20	0.712	H2O	68.70	A	1.3860
NH4Cl	24.50	6.685	(NH4)3PO4	7.00	0.695	H2O	68.50	A + B	1.3920
NH4Cl	24.50	6.542	(NH4)3PO4	5.50	0.534	H2O	70.00	B	1.3905
NH4Cl	25.60	6.674	(NH4)3PO4	2.70	0.256	H2O	71.70	B	1.3860
NH4Cl	27.10	6.948	(NH4)3PO4	0	0	H2O	72.90	B	1.3860

Notes:
   Table 1  ^a  These values were calculated by the compilers.
   Table 1  ^b  The solid phases are: A=(NH₄)₃PO₄·3H₂O; B=NH₄Cl.

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 (NH₄)₃PO₄ were prepared according to directions given elsewhere.³

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

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