IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Ammonium dihydrogenphosphate with Diammonium sulfate and Water

Components:
   (1) Ammonium dihydrogenphosphate; NH4H2PO4; [7722-76-1]  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:
   Bel'chev, F.V.; Bergman, A.G., Zh. Prikl. Khim. (Leningrad) 1944, 17, 520.

Variables:

   Concentration = Composition at –10 ºC, –5 ºC, 0, 10 ºC, 20 ºC and 30 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 NH₄H₂PO₄-(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	Composition₃^(a)	10² * Mass Fraction w₃	Solid Phase(s)^(c)
-10	NH4H2PO4	0	0.0	0.0	(NH4)2SO4	100	29.4	3.2	H2O	1781	70.6	A
-10	NH4H2PO4	5.50	2.8	0.3	(NH4)2SO4	94.5	27.2	2.9	H2O	1879	70.0	A
-10	NH4H2PO4	12.56	6.0	0.7	(NH4)2SO4	87.44	24.0	2.6	H2O	1876	70.0	A
-10	NH4H2PO4	16.41	7.6	0.9	(NH4)2SO4	83.59	22.2	2.4	H2O	1538	70.2	B
-10	NH4H2PO4	11.25	6.3	0.8	(NH4)2SO4	88.74	28.1	3.2	H2O	1518	65.6	B
-10	NH4H2PO4	6.82	4.8	0.7	(NH4)2SO4	93.18	36.1	4.6	H2O	1139	59.1	B
-10	NH4H2PO4	6.71	4.6	0.7	(NH4)2SO4	93.29	37.8	5.0	H2O	1069	57.6	B + C
-10	NH4H2PO4	3.26	2.4	0.4	(NH4)2SO4	96.74	39.1	5.1	H2O	1065	58.5	C
-10	NH4H2PO4	0	0.0	0.0	(NH4)2SO4	100	40.4	5.1	H2O	1081	59.6	C
-5	NH4H2PO4	0	0.0	0.0	(NH4)2SO4	100	16.7	1.5	H2O	3660	83.3	A
-5	NH4H2PO4	11.38	3.4	0.4	(NH4)2SO4	88.62	14.4	1.3	H2O	3708	82.2	A
-5	NH4H2PO4	25.42	7.0	0.7	(NH4)2SO4	74.58	11.6	1.1	H2O	3875	81.4	A
-5	NH4H2PO4	38.74	10.0	1.1	(NH4)2SO4	61.26	9.0	0.8	H2O	4050	81.0	A
-5	NH4H2PO4	56.73	13.7	1.5	(NH4)2SO4	43.27	6.0	0.6	H2O	4270	80.3	A + B
-5	NH4H2PO4	45.46	12.7	1.4	(NH4)2SO4	54.55	8.7	0.8	H2O	3606	78.6	B
-5	NH4H2PO4	23.22	9.6	1.2	(NH4)2SO4	76.78	18.0	1.9	H2O	2270	72.4	B
-5	NH4H2PO4	12.7	7.2	1.0	(NH4)2SO4	87.3	28.1	3.3	H2O	1472	64.7	B
-5	NH4H2PO4	7.77	5.4	0.8	(NH4)2SO4	92.23	36.1	4.7	H2O	1120	58.5	B
-5	NH4H2PO4	7.37	5.2	0.8	(NH4)2SO4	92.63	38.0	5.1	H2O	1010	56.8	B + C
-5	NH4H2PO4	3.0	2.4	0.4	(NH4)2SO4	96.76	39.6	5.2	H2O	1048	58.0	C
-5	NH4H2PO4	0	0.0	0.0	(NH4)2SO4	100	40.8	5.2	H2O	1066	59.2	C
0	NH4H2PO4	100	18.8	2.0	(NH4)2SO4	0	0.0	0.0	H2O	5620	81.2	B
0	NH4H2PO4	49.4	14.7	1.7	(NH4)2SO4	51.6	8.6	0.8	H2O	3550	76.7	B
0	NH4H2PO4	25.42	10.7	1.3	(NH4)2SO4	74.58	17.8	1.9	H2O	2198	71.5	B
0	NH4H2PO4	14.05	8.0	1.1	(NH4)2SO4	85.95	27.6	3.2	H2O	1477	64.4	B
0	NH4H2PO4	8.48	5.9	0.9	(NH4)2SO4	91.52	35.7	4.6	H2O	1098	58.4	B
0	NH4H2PO4	7.42	5.4	0.8	(NH4)2SO4	92.58	38.0	5.1	H2O	1013	56.6	B + C
0	NH4H2PO4	7.03	5.0	0.8	(NH4)2SO4	92.97	38.5	5.2	H2O	1002	56.5	C
0	NH4H2PO4	3.2	2.4	0.4	(NH4)2SO4	96.8	40.0	5.3	H2O	1021	57.6	C
0	NH4H2PO4	0	0.0	0.0	(NH4)2SO4	100	41.2	5.3	H2O	1049	58.8	C
10	NH4H2PO4	100	22.2	2.5	(NH4)2SO4	0	0.0	0.0	H2O	4497	77.8	B
10	NH4H2PO4	55.08	17.4	2.0	(NH4)2SO4	44.92	8.2	0.8	H2O	2985	74.4	B
10	NH4H2PO4	30.69	13.4	1.7	(NH4)2SO4	69.31	17.3	1.9	H2O	2035	69.3	B
10	NH4H2PO4	17.81	10.0	1.4	(NH4)2SO4	82.14	27.0	3.2	H2O	1413	63.0	B
10	NH4H2PO4	11.18	7.6	1.2	(NH4)2SO4	88.92	35.0	4.6	H2O	1068	57.4	B
10	NH4H2PO4	9.12	6.9	1.1	(NH4)2SO4	90.88	38.2	5.3	H2O	952	54.9	B + C
10	NH4H2PO4	6.56	4.9	0.8	(NH4)2SO4	93.44	39.6	5.4	H2O	962	55.5	C
10	NH4H2PO4	3.12	2.4	0.4	(NH4)2SO4	96.88	41.0	5.5	H2O	981	56.6	C
10	NH4H2PO4	0	0.0	0.0	(NH4)2SO4	100	42.0	5.5	H2O	1015	58.0	C
20	NH4H2PO4	100	26.0	3.0	(NH4)2SO4	0	0.0	0.0	H2O	3507	74.0	B
20	NH4H2PO4	60.93	21.3	2.6	(NH4)2SO4	39.07	7.8	0.8	H2O	2606	70.9	B
20	NH4H2PO4	36.55	16.6	2.2	(NH4)2SO4	63.45	16.6	1.9	H2O	1882	66.8	B
20	NH4H2PO4	20.72	12.1	1.7	(NH4)2SO4	79.28	26.3	3.2	H2O	1362	61.6	B
20	NH4H2PO4	13.67	9.5	1.5	(NH4)2SO4	86.33	34.3	4.6	H2O	1040	56.2	B
20	NH4H2PO4	12.62	8.3	1.4	(NH4)2SO4	87.38	38.5	5.5	H2O	887	53.2	B + C
20	NH4H2PO4	6.43	4.8	0.8	(NH4)2SO4	93.57	40.5	5.6	H2O	928	54.7	C
20	NH4H2PO4	2.79	2.3	0.4	(NH4)2SO4	97.21	41.9	5.7	H2O	950	55.8	C
20	NH4H2PO4	0	0.0	0.0	(NH4)2SO4	100	42.9	5.7	H2O	977	57.1	C"
30	NH4H2PO4	100	30.6	3.8	(NH4)2SO4	0	0.0	0.0	H2O	2896	69.4	B
30	NH4H2PO4	66.06	25.2	3.2	(NH4)2SO4	33.94	7.4	0.8	H2O	2268	67.4	B
30	NH4H2PO4	41.83	20.1	2.7	(NH4)2SO4	58.17	16.1	1.9	H2O	1702	63.8	B
30	NH4H2PO4	25.37	15.4	2.3	(NH4)2SO4	74.78	25.4	3.2	H2O	1268	59.2	B
30	NH4H2PO4	17.17	12.0	1.9	(NH4)2SO4	82.83	33.2	4.6	H2O	1004	54.8	B
30	NH4H2PO4	13.39	10.2	1.7	(NH4)2SO4	86.61	38.4	5.7	H2O	849	51.4	B + C
30	NH4H2PO4	9.26	7.2	1.2	(NH4)2SO4	90.74	40.2	5.8	H2O	871	52.6	C
30	NH4H2PO4	5.95	4.7	0.8	(NH4)2SO4	94.05	41.8	5.9	H2O	884	53.5	C
30	NH4H2PO4	2.70	2.3	0.4	(NH4)2SO4	97.30	43.1	6.0	H2O	910	54.6	C
30	NH4H2PO4	0	0.0	0.0	(NH4)2SO4	100	43.7	5.9	H2O	946	56.3	C
-10	NH4H2PO4	0	0.0	0.0	(NH4)2SO4	100	29.4	3.2	H2O	1781	70.6	A
-10	NH4H2PO4	5.50	2.8	0.3	(NH4)2SO4	94.5	27.2	2.9	H2O	1879	70.0	A
-10	NH4H2PO4	12.56	6.0	0.7	(NH4)2SO4	87.44	24.0	2.6	H2O	1876	70.0	A
-10	NH4H2PO4	16.41	7.6	0.9	(NH4)2SO4	83.59	22.2	2.4	H2O	1538	70.2	B
-10	NH4H2PO4	11.25	6.3	0.8	(NH4)2SO4	88.74	28.1	3.2	H2O	1518	65.6	B
-10	NH4H2PO4	6.82	4.8	0.7	(NH4)2SO4	93.18	36.1	4.6	H2O	1139	59.1	B
-10	NH4H2PO4	6.71	4.6	0.7	(NH4)2SO4	93.29	37.8	5.0	H2O	1069	57.6	B + C
-10	NH4H2PO4	3.26	2.4	0.4	(NH4)2SO4	96.74	39.1	5.1	H2O	1065	58.5	C
-10	NH4H2PO4	0	0.0	0.0	(NH4)2SO4	100	40.4	5.1	H2O	1081	59.6	C
-5	NH4H2PO4	0	0.0	0.0	(NH4)2SO4	100	16.7	1.5	H2O	3660	83.3	A
-5	NH4H2PO4	11.38	3.4	0.4	(NH4)2SO4	88.62	14.4	1.3	H2O	3708	82.2	A
-5	NH4H2PO4	25.42	7.0	0.7	(NH4)2SO4	74.58	11.6	1.1	H2O	3875	81.4	A
-5	NH4H2PO4	38.74	10.0	1.1	(NH4)2SO4	61.26	9.0	0.8	H2O	4050	81.0	A
-5	NH4H2PO4	56.73	13.7	1.5	(NH4)2SO4	43.27	6.0	0.6	H2O	4270	80.3	A + B
-5	NH4H2PO4	45.46	12.7	1.4	(NH4)2SO4	54.55	8.7	0.8	H2O	3606	78.6	B
-5	NH4H2PO4	23.22	9.6	1.2	(NH4)2SO4	76.78	18.0	1.9	H2O	2270	72.4	B
-5	NH4H2PO4	12.7	7.2	1.0	(NH4)2SO4	87.3	28.1	3.3	H2O	1472	64.7	B
-5	NH4H2PO4	7.77	5.4	0.8	(NH4)2SO4	92.23	36.1	4.7	H2O	1120	58.5	B
-5	NH4H2PO4	7.37	5.2	0.8	(NH4)2SO4	92.63	38.0	5.1	H2O	1010	56.8	B + C
-5	NH4H2PO4	3.0	2.4	0.4	(NH4)2SO4	96.76	39.6	5.2	H2O	1048	58.0	C
-5	NH4H2PO4	0	0.0	0.0	(NH4)2SO4	100	40.8	5.2	H2O	1066	59.2	C
0	NH4H2PO4	100	18.8	2.0	(NH4)2SO4	0	0.0	0.0	H2O	5620	81.2	B
0	NH4H2PO4	49.4	14.7	1.7	(NH4)2SO4	51.6	8.6	0.8	H2O	3550	76.7	B
0	NH4H2PO4	25.42	10.7	1.3	(NH4)2SO4	74.58	17.8	1.9	H2O	2198	71.5	B
0	NH4H2PO4	14.05	8.0	1.1	(NH4)2SO4	85.95	27.6	3.2	H2O	1477	64.4	B
0	NH4H2PO4	8.48	5.9	0.9	(NH4)2SO4	91.52	35.7	4.6	H2O	1098	58.4	B
0	NH4H2PO4	7.42	5.4	0.8	(NH4)2SO4	92.58	38.0	5.1	H2O	1013	56.6	B + C
0	NH4H2PO4	7.03	5.0	0.8	(NH4)2SO4	92.97	38.5	5.2	H2O	1002	56.5	C
0	NH4H2PO4	3.2	2.4	0.4	(NH4)2SO4	96.8	40.0	5.3	H2O	1021	57.6	C
0	NH4H2PO4	0	0.0	0.0	(NH4)2SO4	100	41.2	5.3	H2O	1049	58.8	C
10	NH4H2PO4	100	22.2	2.5	(NH4)2SO4	0	0.0	0.0	H2O	4497	77.8	B
10	NH4H2PO4	55.08	17.4	2.0	(NH4)2SO4	44.92	8.2	0.8	H2O	2985	74.4	B
10	NH4H2PO4	30.69	13.4	1.7	(NH4)2SO4	69.31	17.3	1.9	H2O	2035	69.3	B
10	NH4H2PO4	17.81	10.0	1.4	(NH4)2SO4	82.14	27.0	3.2	H2O	1413	63.0	B
10	NH4H2PO4	11.18	7.6	1.2	(NH4)2SO4	88.92	35.0	4.6	H2O	1068	57.4	B
10	NH4H2PO4	9.12	6.9	1.1	(NH4)2SO4	90.88	38.2	5.3	H2O	952	54.9	B + C
10	NH4H2PO4	6.56	4.9	0.8	(NH4)2SO4	93.44	39.6	5.4	H2O	962	55.5	C
10	NH4H2PO4	3.12	2.4	0.4	(NH4)2SO4	96.88	41.0	5.5	H2O	981	56.6	C
10	NH4H2PO4	0	0.0	0.0	(NH4)2SO4	100	42.0	5.5	H2O	1015	58.0	C
20	NH4H2PO4	100	26.0	3.0	(NH4)2SO4	0	0.0	0.0	H2O	3507	74.0	B
20	NH4H2PO4	60.93	21.3	2.6	(NH4)2SO4	39.07	7.8	0.8	H2O	2606	70.9	B
20	NH4H2PO4	36.55	16.6	2.2	(NH4)2SO4	63.45	16.6	1.9	H2O	1882	66.8	B
20	NH4H2PO4	20.72	12.1	1.7	(NH4)2SO4	79.28	26.3	3.2	H2O	1362	61.6	B
20	NH4H2PO4	13.67	9.5	1.5	(NH4)2SO4	86.33	34.3	4.6	H2O	1040	56.2	B
20	NH4H2PO4	12.62	8.3	1.4	(NH4)2SO4	87.38	38.5	5.5	H2O	887	53.2	B + C
20	NH4H2PO4	6.43	4.8	0.8	(NH4)2SO4	93.57	40.5	5.6	H2O	928	54.7	C
20	NH4H2PO4	2.79	2.3	0.4	(NH4)2SO4	97.21	41.9	5.7	H2O	950	55.8	C
20	NH4H2PO4	0	0.0	0.0	(NH4)2SO4	100	42.9	5.7	H2O	977	57.1	C"
30	NH4H2PO4	100	30.6	3.8	(NH4)2SO4	0	0.0	0.0	H2O	2896	69.4	B
30	NH4H2PO4	66.06	25.2	3.2	(NH4)2SO4	33.94	7.4	0.8	H2O	2268	67.4	B
30	NH4H2PO4	41.83	20.1	2.7	(NH4)2SO4	58.17	16.1	1.9	H2O	1702	63.8	B
30	NH4H2PO4	25.37	15.4	2.3	(NH4)2SO4	74.78	25.4	3.2	H2O	1268	59.2	B
30	NH4H2PO4	17.17	12.0	1.9	(NH4)2SO4	82.83	33.2	4.6	H2O	1004	54.8	B
30	NH4H2PO4	13.39	10.2	1.7	(NH4)2SO4	86.61	38.4	5.7	H2O	849	51.4	B + C
30	NH4H2PO4	9.26	7.2	1.2	(NH4)2SO4	90.74	40.2	5.8	H2O	871	52.6	C
30	NH4H2PO4	5.95	4.7	0.8	(NH4)2SO4	94.05	41.8	5.9	H2O	884	53.5	C
30	NH4H2PO4	2.70	2.3	0.4	(NH4)2SO4	97.30	43.1	6.0	H2O	910	54.6	C
30	NH4H2PO4	0	0.0	0.0	(NH4)2SO4	100	43.7	5.9	H2O	946	56.3	C

Notes:
   Table 1  ^a  The composition unit is mol/100 mol of solute.
   Table 1  ^b  The molalities were calculated by the compilers.
   Table 1  ^c  The solid phases are: A=ice; B=NH₄H₂PO₄; C=(NH₄)₂SO₄.

Method/Apparatus/Procedure:
   A visual polythermic method was used. 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.