IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Diammonium hydrogenphosphate with Diammonium persulfate and Water

Components:
   (1) Diammonium hydrogenphosphate; (NH4)2HPO4; [7783-28-0]  NIST Chemistry WebBook for detail
   (2) Diammonium persulfate; (NH4)2S2O8; [7727-54-0]  NIST Chemistry WebBook for detail
   (3) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Babenko, A.M.; Andrianov, A.M., Ukr. Khim. Zh. 1982, 48, 15.

Variables:

   Concentration = Composition and temperature

Prepared By:
   J. Eysseltová

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

Solubility in the (NH₄)₂HPO₂-(NH₄)₂S₂O₈-H₂O system
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	Solid Phase(s)^(b)
-7.3	(NH4)2S2O8	32.0	2.06	(NH4)2HPO4	0.0	0.0	H2O	68.0	A + X
-8.3	(NH4)2S2O8	28.0	1.89	(NH4)2HPO4	7.2	0.84	H2O	64.8	A + X
-9.0	(NH4)2S2O8	27.9	1.88	(NH4)2HPO4	7.1	0.81	H2O	65.1	A + X
-9.0	(NH4)2S2O8	22.0	1.54	(NH4)2HPO4	15.6	1.89	H2O	62.4	A + X
-10.2	(NH4)2S2O8	21.0	1.46	(NH4)2HPO4	16.0	1.92	H2O	63.0	A + X
-10.5	(NH4)2S2O8	16.0	1.14	(NH4)2HPO4	22.68	2.801	H2O	61.32	A + X
-11.0	(NH4)2S2O8	15.2	1.10	(NH4)2HPO4	24.0	2.99	H2O	60.8	A + X
-11.8	(NH4)2S2O8	12.0	0.879	(NH4)2HPO4	28.16	3.563	H2O	59.84	A + X + B
-5.4	(NH4)2S2O8	0.0	0.0	(NH4)2HPO4	26.3	2.70	H2O	73.7	A + B
-9.0	(NH4)2S2O8	7.2	0.49	(NH4)2HPO4	28.0	3.27	H2O	64.8	A + B
+16.0	(NH4)2S2O8	0.0	0.0	(NH4)2HPO4	39.6	4.96	H2O	60.4	B + C
+29.0	(NH4)2S2O8	3.0	0.23	(NH4)2HPO4	40.74	5.483	H2O	56.26	B + C
+32.5	(NH4)2S2O8	6.0	0.49	(NH4)2HPO4	40.0	5.61	H2O	54.0	B + C + D
+13.0	(NH4)2S2O8	8.0	0.60	(NH4)2HPO4	33.12	4.259	H2O	58.88	B + D
+27.8	(NH4)2S2O8	6.4	0.49	(NH4)2HPO4	36.0	4.73	H2O	57.6	B + D
+22.5	(NH4)2S2O8	13.8	1.10	(NH4)2HPO4	31.0	4.25	H2O	55.2	B + D + X
+14.5	(NH4)2S2O8	29.4	2.36	(NH4)2HPO4	16.0	2.22	H2O	54.6	D + X
+23.0	(NH4)2S2O8	34.4	2.92	(NH4)2HPO4	14.0	2.05	H2O	51.6	D + X
+12.2	(NH4)2S2O8	19.0	1.46	(NH4)2HPO4	24.0	3.19	H2O	57.0	D + X
+11.0	(NH4)2S2O8	24.0	1.88	(NH4)2HPO4	20.0	2.70	H2O	56.0	D + X
-10	(NH4)2S2O8	21.0	1.46	(NH4)2HPO4	16.0	1.92	H2O	63.0	A
-10	(NH4)2S2O8	15.6	1.10	(NH4)2HPO4	22.0	2.67	H2O	62.4	A
-10	(NH4)2S2O8	14.0	0.977	(NH4)2HPO4	22.22	2.802	H2O	62.78	A
-10	(NH4)2S2O8	21.125	1.4607	(NH4)2HPO4	15.5	1.85	H2O	63.375	X
-10	(NH4)2S2O8	16.1	1.15	(NH4)2HPO4	22.653	2.8007	H2O	61.247	X
-10	(NH4)2S2O8	15.16	1.096	(NH4)2HPO4	24.2	3.02	H2O	60.64	X
-10	(NH4)2S2O8	12.2	0.895	(NH4)2HPO4	28.096	3.5634	H2O	59.704	X
-5	(NH4)2S2O8	23.0	1.31	(NH4)2HPO4	0.00	0.0	H2O	77.0	A
-5	(NH4)2S2O8	15.0	0.859	(NH4)2HPO4	8.5	0.84	H2O	76.5	A
-5	(NH4)2S2O8	8.5	0.49	(NH4)2HPO4	15.0	1.48	H2O	76.5	A
-5	(NH4)2S2O8	18.8	1.10	(NH4)2HPO4	6.0	0.60	H2O	75.2	A
-5	(NH4)2S2O8	0.0	0.0	(NH4)2HPO4	24.3	2.43	H2O	75.7	A
-5	(NH4)2S2O8	0.0	0.0	(NH4)2HPO4	26.4	2.72	H2O	73.6	A
-5	(NH4)2S2O8	33.4	2.20	(NH4)2HPO4	0.0	0.0	H2O	66.6	X
-5	(NH4)2S2O8	29.5	2.04	(NH4)2HPO4	7.05	0.841	H2O	63.45	X
-5	(NH4)2S2O8	27.6	1.88	(NH4)2HPO4	8.0	0.94	H2O	64.4	X
-5	(NH4)2S2O8	23.5	1.68	(NH4)2HPO4	15.3	1.89	H2O	61.2	X
-5	(NH4)2S2O8	20.875	1.461	(NH4)2HPO4	16.5	2.00	H2O	62.625	X
-5	(NH4)2S2O8	18.0	1.32	(NH4)2HPO4	22.14	2.801	H2O	59.86	X
-5	(NH4)2S2O8	13.0	0.963	(NH4)2HPO4	27.84	3.563	H2O	59.16	X
-5	(NH4)2S2O8	15.0	1.10	(NH4)2HPO4	25.0	3.16	H2O	60.0	X
-5	(NH4)2S2O8	7.2	0.49	(NH4)2HPO4	28.0	3.27	H2O	64.8	B
0	(NH4)2S2O8	35.6	2.42	(NH4)2HPO4	0.0	0.0	H2O	64.4	X
0	(NH4)2S2O8	31.5	2.24	(NH4)2HPO4	6.85	0.841	H2O	61.65	X
0	(NH4)2S2O8	25.5	1.87	(NH4)2HPO4	14.9	1.89	H2O	59.6	X
0	(NH4)2S2O8	20.0	1.50	(NH4)2HPO4	21.6	2.80	H2O	58.4	X
0	(NH4)2S2O8	7.14	0.487	(NH4)2HPO4	28.6	3.37	H2O	64.26	X
0	(NH4)2S2O8	14.9	1.10	(NH4)2HPO4	25.5	3.24	H2O	59.6	X
0	(NH4)2S2O8	20.5	1.46	(NH4)2HPO4	18.0	2.22	H2O	61.5	X
0	(NH4)2S2O8	26.7	1.88	(NH4)2HPO4	11.0	1.34	H2O	62.3	X
0	(NH4)2S2O8	0.0	0.0	(NH4)2HPO4	27.8	2.92	H2O	72.2	B
10	(NH4)2S2O8	39.6	2.87	(NH4)2HPO4	0.0	0.0	H2O	60.4	X
10	(NH4)2S2O8	35.0	2.62	(NH4)2HPO4	6.5	0.84	H2O	58.5	X
10	(NH4)2S2O8	29.5	1.95	(NH4)2HPO4	4.1	0.47	H2O	66.4	X
10	(NH4)2S2O8	24.0	1.82	(NH4)2HPO4	18.24	2.391	H2O	57.76	X
10	(NH4)2S2O8	16.0	1.23	(NH4)2HPO4	26.88	3.563	H2O	57.12	X
10	(NH4)2S2O8	24.6	1.88	(NH4)2HPO4	18.0	2.37	H2O	57.4	X
10	(NH4)2S2O8	19.25	1.461	(NH4)2HPO4	23.0	3.02	H2O	57.75	X
10	(NH4)2S2O8	6.5	0.46	(NH4)2HPO4	31.0	3.76	H2O	62.5	B
10	(NH4)2S2O8	0.0	0.0	(NH4)2HPO4	35.0	4.08	H2O	65.0	B
10	(NH4)2S2O8	14.5	1.10	(NH4)2HPO4	27.5	3.59	H2O	58.0	B
20	(NH4)2S2O8	33.5	2.76	(NH4)2HPO4	13.3	1.89	H2O	53.2	D
20	(NH4)2S2O8	28.0	2.33	(NH4)2HPO4	19.44	2.801	H2O	52.56	D
20	(NH4)2S2O8	18.0	1.41	(NH4)2HPO4	26.24	3.563	H2O	55.76	D
20	(NH4)2S2O8	10.2	0.778	(NH4)2HPO4	32.328	4.2594	H2O	57.472	D
20	(NH4)2S2O8	6.6	0.49	(NH4)2HPO4	34.0	4.33	H2O	59.4	B
20	(NH4)2S2O8	14.0	1.10	(NH4)2HPO4	30.0	4.06	H2O	56.0	D
20	(NH4)2S2O8	18.5	1.46	(NH4)2HPO4	26.0	3.55	H2O	55.5	D
20	(NH4)2S2O8	39.0	3.11	(NH4)2HPO4	6.1	0.84	H2O	54.9	X

Notes:
   Table 1  ^a  The molalities were calculated by the compiler.
   Table 1  ^b  The solid phases are: A=ice; B=(NH₄)₂HPO₂·2H₂O; C=(NH₄)₂HPO₂; D=(NH₄)₂S₂O₈; X="m(NH₄)₂S₂O₈·n(NH₄)₂HPO₂" (an unidentified solid phase - either solid solution or a compound).

Method/Apparatus/Procedure:
   An improved visual polythermic method¹ was used.

Source and Purity of Materials:
   Reagent grade salts were recrystallized and dried at 40 °C to 50 °C.

Estimated Errors:
   Solubility: No information given.
   Temperature: Precision of temperature measurement was ± 0.4 K.

References:
   ¹L. N. Erayzer and I. M. Kaganskiy, Zavod. Lab. 1, 119 (1967).