IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Diammonium hydrogenphosphate with Diammonium sulfate and Water

Components:
   (1) Diammonium hydrogenphosphate; (NH4)2HPO4; [7783-28-0]  NIST Chemistry WebBook for detail
   (2) Diammonium sulfate; (NH4)2SO4; [7783-20-2]  NIST Chemistry WebBook for detail
   (3) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Chernova, K.S.; Korzh, E.V., Zh. Obshch. Khim. 16, 171 (1946).

Variables:

   Concentration = Composition at 0 ºC, 10 ºC and 20 ºC.

Prepared By:
   L. V. Chernykh and J. Eysseltová

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

Solubility isotherms in the (NH₄)₂HPO₂-(NH₄)₂SO₄-H₂O system
t/°C	Chemical₁	Composition₁^(a)	10² * Mass Fraction w₁	m₁ [mol/kg]^(b)	Chemical₂	Composition₂^(a)	10² * Mass Fraction w₂	m₂ [mol/kg]^(b)	Chemical₃	10² * Mass Fraction w₃	Solid Phase(s)^(c)
0	(NH4)2HPO4	43.20	27.80	3.27	(NH4)2SO4	12.1	7.8	0.92	H2O	64.40	A
0	(NH4)2HPO4	35.90	22.20	2.71	(NH4)2SO4	25.5	15.80	1.93	H2O	62.00	A
0	(NH4)2HPO4	30.49	17.50	2.30	(NH4)2SO4	43.5	25.00	3.29	H2O	57.50	A
0	(NH4)2HPO4	25.00	14.00	1.89	(NH4)2SO4	53.7	30.00	4.05	H2O	56.00	A
0	(NH4)2HPO4	24.10	13.20	1.83	(NH4)2SO4	58.9	32.10	4.44	H2O	54.70	A
0	(NH4)2HPO4	---	0.00	0.00	(NH4)2SO4	71.2	41.60	5.39	H2O	58.40	B
10	(NH4)2HPO4	49.40	30.40	3.73	(NH4)2SO4	12.81	7.90	0.97	H2O	61.70	A
10	(NH4)2HPO4	40.0	24.20	3.04	(NH4)2SO4	25.65	15.50	1.95	H2O	60.30	A
10	(NH4)2HPO4	35.30	19.80	2.67	(NH4)2SO4	42.90	24.10	3.25	H2O	56.10	C
10	(NH4)2HPO4	30.00	16.40	2.27	(NH4)2SO4	52.80	28.90	4.00	H2O	54.70	C
10	(NH4)2HPO4	30.50	16.00	2.31	(NH4)2SO4	60.20	31.60	4.56	H2O	52.40	C
10	(NH4)2HPO4	---	0.00	0.00	(NH4)2SO4	73.48	42.40	5.57	H2O	57.60	B
20	(NH4)2HPO4	58.3	34.20	4.40	(NH4)2SO4	11.78	6.90	0.89	H2O	58.90	C
20	(NH4)2HPO4	47.5	27.40	3.58	(NH4)2SO4	25.5	14.70	1.92	H2O	57.90	C
20	(NH4)2HPO4	38.48	21.20	2.92	(NH4)2SO4	43.40	23.80	3.27	H2O	55.00	C
20	(NH4)2HPO4	34.9	18.60	2.65	(NH4)2SO4	52.90	28.20	4.01	H2O	53.20	C
20	(NH4)2HPO4	34.6	17.80	2.62	(NH4)2SO4	59.80	30.80	4.53	H2O	51.40	C
20	(NH4)2HPO4	---	0.00	0.00	(NH4)2SO4	77.30	43.60	5.85	H2O	56.40	B

Notes:
   Table 1  ^a  The composition unit is: g/100g H₂O.
   Table 1  ^b  The molalities were calculated by the compilers.
   Table 1  ^c  The solid phases are: A=(NH₄)₂HPO₂·2H₂O; B=(NH₄)₂SO₄; C=(NH₄)₂HPO₂.

Method/Apparatus/Procedure:
   A visual polythermic method was used. The isotherms were derived from the results of this investigation. No other details are given.

Source and Purity of Materials:
   No information is given.

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