IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Ammonia with Phosphoric acid and Water

Components:
   (1) Ammonia; NH3; [7664-41-7]  NIST Chemistry WebBook for detail
   (2) Phosphoric acid; H3PO4; [7664-38-2]  NIST Chemistry WebBook for detail
   (3) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Shenkin, Ya.S.; Ruchnova, S.A.; Shenkina, A.P., Zh. Neorg. Khim. 1969, 14, 1420.

Variables:

   Concentration = Temperature and composition at atmospheric pressure.

Prepared By:
   J. Eysseltová

Experimental Remarks:

   Remarks: NOTE: According to the authors, the "temperature depression" (not defined) is a nearly linear function of –lg N.

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

Composition and boiling points in the NH₄H₂PO₄-H₃PO₄-H₂O system.
Boiling Point/°C	Chemical₁	10² * Mass Fraction w₁	Chemical₂	10² * Mass Fraction w₂	Chemical₃	10² * Mass Fraction w₃	m₃ [mol/kg]	Chemical₄	10² * Mass Fraction w₄	m₄ [mol/kg]	Chemical₅	10² * Mass Fraction w₅	Mole Fractio₅n^{-lg N (b)}	Comment(s)
109.4	NH4H2PO4	71.84	H3PO4	0.00	NH3 (a)	10.63	22.18	H3PO4 (a)	61.20	22.18	H2O (a)	28.16	0.1463	0.1463 -lg N (b)
110.8	NH4H2PO4	67.90	H3PO4	1.82	NH3 (a)	10.05	19.49	H3PO4 (a)	59.66	20.11	H2O (a)	30.28	0.1343	0.1343
111.1	NH4H2PO4	64.20	H3PO4	8.90	NH3 (a)	9.50	20.75	H3PO4 (a)	63.59	24.12	H2O (a)	26.90	0.1568	0.1568
112.0	NH4H2PO4	60.01	H3PO4	14.12	NH3 (a)	8.88	20.16	H3PO4 (a)	65.24	25.73	H2O (a)	25.87	0.1656	0.1656
115.1	NH4H2PO4	57.22	H3PO4	22.34	NH3 (a)	8.47	24.33	H3PO4 (a)	71.08	35.49	H2O (a)	20.44	0.1865	0.1865
119.2	NH4H2PO4	59.44	H3PO4	23.21	NH3 (a)	8.80	29.78	H3PO4 (a)	73.85	43.43	H2O (a)	17.35	0.2510	0.2510
122.9	NH4H2PO4	58.29	H3PO4	29.02	NH3 (a)	8.63	39.93	H3PO4 (a)	78.68	63.26	H2O (a)	12.69	0.3633	0.3633
147.0	NH4H2PO4	64.53	H3PO4	30.98	NH3 (a)	9.55	124.9	H3PO4 (a)	85.95	195.3	H2O (a)	4.49	0.6556	0.6556
152.0	NH4H2PO4	71.50	H3PO4	24.64	NH3 (a)	10.58	161.0	H3PO4 (a)	85.55	226.2	H2O (a)	3.86	0.7054	0.7054
155.6	NH4H2PO4	76.76	H3PO4	19.50	NH3 (a)	11.36	178.4	H3PO4 (a)	84.89	231.6	H2O (a)	3.74	0.7146	0.7146
149.8	NH4H2PO4	79.72	H3PO4	16.24	NH3 (a)	11.80	171.5	H3PO4 (a)	84.15	212.5	H2O (a)	4.04	0.6840	0.6840
161.0	NH4H2PO4	82.82	H3PO4	14.71	NH3 (a)	12.26	291.5	H3PO4 (a)	85.26	352.2	H2O (a)	2.47	0.8662	0.8662
170.8	NH4H2PO4	83.17	H3PO4	14.75	NH3 (a)	12.31	347.6	H3PO4 (a)	85.60	419.9	H2O (a)	2.08	0.9318	0.9318
170.0	NH4H2PO4	86.60	H3PO4	12.31	NH3 (a)	12.82	690.6	H3PO4 (a)	86.08	805.9	H2O (a)	1.09	1.1906	1.1906
212.0	NH4H2PO4	90.56	H3PO4	6.00	NH3 (a)	13.41	228.8	H3PO4 (a)	83.15	246.6	H2O (a)	3.44	0.7375	0.7375
210.5	NH4H2PO4	90.56	H3PO4	8.19	NH3 (a)	13.41	629.8	H3PO4 (a)	85.34	696.6	H2O (a)	1.25	1.1805	1.1805
221.5	NH4H2PO4	92.77	H3PO4	4.39	NH3 (a)	13.73	283.9	H3PO4 (a)	83.42	299.7	H2O (a)	2.84	0.9079	0.9079

Notes:
   Table 1  ^a  These values were calculated by the compilers.
   Table 1  ^b  N is the mol fraction of water in the system.

Method/Apparatus/Procedure:
   The method was the same as that described earlier.¹

Source and Purity of Materials:
   Chemically pure salts were recrystallized before being used.

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

References:
   ¹Shenkin, Ya.S.; Ruchnova, S.A.; Shenkina, A.P. Zh. Neorg. Khim. 1968, 13, 256.