IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Ammonium dihydrogenphosphate with Diammonium hydrogenphosphate, Ammonium nitrate and Water

Components:
   (1) Ammonium dihydrogenphosphate; NH4H2PO4; [7722-76-1]  NIST Chemistry WebBook for detail
   (2) Ammonium nitrate; NH4NO3; [6484-52-2]  NIST Chemistry WebBook for detail
   (3) Diammonium hydrogenphosphate; (NH4)2HPO4; [7783-28-0]  NIST Chemistry WebBook for detail
   (4) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Skum, L.S..; Fridman, S.D, Khim. Prom. (Moscow) 1971, 47, 588.

Variables:

   Concentration = Composition at 140 ºC to 170 ºC and a N/P₂O₅ ratio = 1.

Prepared By:
   J. Eysseltová

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

Solubility in the NH₄H₂PO₄-(NH₄)₂HPO₄-NH₄NO₃-H₂O system with the ratio N/P₂O₅ = 1.
t/°C	Chemical₁	10² * Mass Fraction w₁	m₁ [mol/kg]^(a)	Chemical₂	10² * Mass Fraction w₂	m₂ [mol/kg]^(a)	Chemical₃	10² * Mass Fraction w₃	m₃ [mol/kg]^(a)	Chemical₄	10² * Mass Fraction w₄	Solid Phase(s)
140	NH4NO3	46.9	30.5	NH4H2PO4	33.9	15.3	(NH4)2HPO4	----	----	H2O	19.20	NH4H2PO4
140	NH4NO3	47.6	33.0	NH4H2PO4	30.5	14.7	(NH4)2HPO4	3.90	1.64	H2O	18.00	"
140	NH4NO3	52.2	65.2	NH4H2PO4	26.3	22.9	(NH4)2HPO4	11.5	8.71	H2O	10.00	"
140	NH4NO3	55.1	137.7	NH4H2PO4	24.7	42.9	(NH4)2HPO4	15.2	23.0	H2O	5.00	"
140	NH4NO3	56.3	234.4	NH4H2PO4	24.6	71.3	(NH4)2HPO4	16.1	40.6	H2O	3.00	"
150	NH4NO3	46.9	34.1	NH4H2PO4	35.9	18.1	(NH4)2HPO4	----	----	H2O	17.20	"
150	NH4NO3	52.2	65.2	NH4H2PO4	28.7	24.9	(NH4)2HPO4	9.10	6.89	H2O	10.00	"
150	NH4NO3	55.1	137.7	NH4H2PO4	27.7	48.2	(NH4)2HPO4	12.2	18.5	H2O	5.00	"
150	NH4NO3	56.3	234.4	NH4H2PO4	27.5	79.7	(NH4)2HPO4	13.2	33.3	H2O	3.00	"
160	NH4NO3	52.3	66.7	NH4H2PO4	37.9	33.6	(NH4)2HPO4	----	----	H2O	9.80	"
160	NH4NO3	52.2	65.2	NH4H2PO4	32.7	28.4	(NH4)2HPO4	5.10	3.67	H2O	10.00	"
160	NH4NO3	55.1	137.7	NH4H2PO4	31.2	54.2	(NH4)2HPO4	8.70	12.5	H2O	5.00	"
160	NH4NO3	56.3	234.5	NH4H2PO4	30.7	89.0	(NH4)2HPO4	10.0	24.0	H2O	3.00	"
170	NH4NO3	55.0	134.7	NH4H2PO4	39.9	68.0	(NH4)2HPO4	----	----	H2O	5.10	"
170	NH4NO3	55.1	137.7	NH4H2PO4	37.1	64.5	(NH4)2HPO4	2.80	4.24	H2O	5.00	"
170	NH4NO3	56.3	234.4	NH4H2PO4	35.4	102.6	(NH4)2HPO4	5.30	13.4	H2O	3.00	"

Notes:
   Table 1  ^a  The molalities were calculated by the compiler.

Method/Apparatus/Procedure:
   A visual polythermic method was used.^1,2

Source and Purity of Materials:
   No information is given.

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

References:
   ¹Bergman, A.G.; Luzhnaya, N.P. Fiziko-khimicheskiye Osnovy Izucheniya i Ispol'zovaiya Solyanykh Mestorozhdeniy Khlorid-sul'fatnogo Tipa, Moscow, IAN SSSR 1951.
   ²Fridman, S.D.; Polyakov, N.N.; Skum, L.S.; Kirindasova, R.Ya. Khim. Prom. (Moscow) 1970, 46, 191.