IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

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 Solubility System: Ammonium dihydrogenphosphate with Water

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Components:
   (1) Ammonium dihydrogenphosphate; NH4H2PO4; [7722-76-1]  NIST Chemistry WebBook for detail
   (2) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Myl, J.; Solc, Z.; Kvapil, J.; Schierová, E., Sb. Ved. Praci VSChT Pardubice (Transl. of the University of Chemical Technology at Pardubice) 1961, 2, 63.

Variables:

   Concentration = Composition and temperature.

Prepared By:
   J. Eysseltová

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

Composition of saturated solutions of NH₄H₂PO₄ in water.

t/°C	Chemical1	Composition1 [g/100 g H2O](a)	102 * Mass Fraction w1(b)	m1 [mol/kg]	Chemical2	102 * Mass Fraction w2(b)
25	NH4H2PO4	40.8	29.0	3.55	H2O	71.0
30	NH4H2PO4	45.3	31.2	3.94	H2O	68.8
40	NH4H2PO4	55.8	35.8	4.85	H2O	64.2
50	NH4H2PO4	68.2	40.5	5.93	H2O	59.5
60	NH4H2PO4	82.8	45.3	7.20	H2O	54.7

Notes:
   Table 1  ^a  The composition units are: g/100 g H₂O.
   Table 1  ^b  These values were calculated by the compiler.

Method/Apparatus/Procedure:
   A modification of Toepler's method¹ was used.

Source and Purity of Materials:
   No information is given.

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

References:
   ¹J. Myl and J. Kvapil, Coll.. Czechoslov. Chem. Commun. 25, 194 (1960).

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Last updated: February 18, 2015 (Created: August 17, 2007)