IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Ammonia with Phosphoric acid, Calcium oxide and Water

Components:
   (1) Ammonia; NH3; [7664-41-7]  NIST Chemistry WebBook for detail
   (2) Calcium oxide; CaO; [1305-78-8]  NIST Chemistry WebBook for detail
   (3) Phosphoric acid; H3PO4; [7664-38-2]  NIST Chemistry WebBook for detail
   (4) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Flatt, R.; Brunisholz, G.; Chapuis-Gottreaux, S., Helv. Chim. Acta 1951, 34, 884.

Variables:

   Concentration = Composition at 25 ºC.

Prepared By:
   J. Eysseltová

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

Table I. Invariant points in the (NH₄)₃PO₄-Ca₃(PO₄)₂-H₃PO₄-H₂O system at 25 °C.
Solution number	Chemical₁	Solubility₁ [eq %]	Chemical₂	Solubility₂ [eq %]	Chemical₃	Solubility₃ [eq %]	Chemical₄	Mole Fraction₄^(a)	Solid Phase(s)^(b)
1	Ca2+	traces	NH4+	12.70	H+	87.30	H2O	25	A + B + C
2 (c)	Ca2+	5.64	NH4+	13.83	H+	80.53	H2O	138	B + C + D
3 (d)	Ca2+	15.61	NH4+	7.00	H+	77.39	H2O	271	C + D + E
4	Ca2+	14.62	NH4+	7.50	H+	77.88	H2O	263	C + D + E
5 (d)	Ca2+	7.02	NH4+	19.29	H+	72.79	H2O	291	B + D + E
6	Ca2+	8.00	NH4+	17.70	H+	74.30	H2O	245	B + D + E

Table II. Solutions coexisting with two solid phases in the (NH₄)₃PO₄-Ca₃(PO₄)₂-H₃PO₄-H₂O system at 25 °C.
Solution number	Chemical₁	Solubility₁ [eq %]	Chemical₂	Solubility₂ [eq %]	Chemical₃	Solubility₃ [eq %]	Chemical₄	Mole Fraction₄^(a)	Solid Phase(s)^(b)
7	Ca3+	traces	NH4+	8.85	H+	91.15	H2O	6.46	A + B
8	Ca3+	traces	NH4+	10.03	H+	89.97	H2O	20.0	"
9	Ca3+	0.14	NH4+	12.74	H+	87.12	H2O	32.4	A + C
10	Ca3+	0.66	NH4+	12.90	H+	86.44	H2O	56.6	"
11	Ca3+	1.14	NH4+	13.01	H+	85.85	H2O	86.7	"
12	Ca3+	2.30	NH4+	13.30	H+	84.40	H2O	91.7	"
13	Ca3+	3.92	NH4+	13.58	H+	82.50	H2O	118	A + C
14	Ca3+	5.36	NH4+	13.87	H+	80.77	H2O	137.5	"
15	Ca3+	5.26	NH4+	13.92	H+	80.82	H2O	135.5	"
16	Ca3+	6.62	NH4+	13.38	H+	80.00	H2O	159	A + D
17	Ca3+	7.36	NH4+	12.87	H+	79.77	H2O	170	"
18	Ca3+	7.90	NH4+	12.48	H+	79.62	H2O	178	"
19	Ca3+	10.79	NH4+	9.93	H+	79.25	H2O	210	"
20	Ca3+	10.35	NH4+	10.50	H+	79.15	H2O	211	"
21	Ca3+	11.49	NH4+	9.50	H+	79.01	H2O	222	"
22	Ca3+	12.07	NH4+	9.25	H+	78.68	H2O	233	"
23	Ca3+	14.43	NH4+	7.50	H+	78.07	H2O	260	"
24	Ca3+	6.01	NH4+	14.30	H+	79.69	H2O	153	C + D
25	Ca3+	6.09	NH4+	14.41	H+	79.50	H2O	152	"
26	Ca3+	6.41	NH4+	14.72	H+	78.87	H2O	161	"
27	Ca3+	6.58	NH4+	15.11	H+	78.31	H2O	171	"
28	Ca3+	6.93	NH4+	15.38	H+	77.69	H2O	181	"
29	Ca3+	7.40	NH4+	16.01	H+	76.59	H2O	197	"
30	Ca3+	7.88	NH4+	17.07	H+	75.05	H2O	226	"
31	Ca3+	8.10	NH4+	18.65	H+	73.25	H2O	260	"
32	Ca3+	17.15	NH4+	4.04	H+	78.81	H2O	298	A + E
33 (c)	Ca3+	18.85	NH4+	3.19	H+	77.96	H2O	298	"
34	Ca3+	17.90	NH4+	2.70	H+	79.40	H2O	342	"
35	Ca3+	11.55	NH4+	12.05	H+	76.40	H2O	260	D + E
36 (c)	Ca3+	11.62	NH4+	14.74	H+	73.64	H2O	314	"
37 (c)	Ca3+	10.31	NH4+	16.69	H+	73.00	H2O	314	"
38	Ca3+	7.01	NH4+	19.58	H+	73.41	H2O	274	C + E
39	Ca3+	6.13	NH4+	20.73	H+	74.14	H2O	294	"
40	Ca3+	4.70	NH4+	23.80	H+	71.50	H2O	349	"
41	Ca3+	4.58	NH4+	23.91	H+	71.51	H2O	364	"
42 (c)	Ca3+	3.95	NH4+	26.44	H+	69.61	H2O	409	"
43 (c)	Ca3+	2.15	NH4+	30.02	H+	67.83	H2O	452	"
44 (c)	Ca3+	2.01	NH4+	30.90	H+	67.09	H2O	504	"
45	Ca3+	0.81	NH4+	32.32	H+	66.87	H2O	494	"
46	Ca3+	0.38	NH4+	39.32	H+	60.30	H2O	353	"

Table III. Solutions in equilibrium with one solid phase in the (NH₄)₃PO₄-Ca₃(PO₄)₂-H₃PO₄-H₂O system at 25 °C.
Solution number	Chemical₁	Solubility₁ [eq %]	Chemical₂	Solubility₂ [eq %]	Chemical₃	Solubility₃ [eq %]	Chemical₄	Mole Fraction₄^(a)	Solid Phase(s)^(b)
47	Ca2+	2.12	NH4+	8.08	H+	89.80	H2O	89	A
48	Ca2+	6.43	NH4+	5.50	H+	88.07	H2O	161	"
49	Ca2+	6.61	NH4+	8.76	H+	84.63	H2O	162	"
50	Ca2+	2.50	NH4+	13.20	H+	84.30	H2O	96	"
51	Ca2+	11.41	NH4+	4.49	H+	84.10	H2O	231	"
52	Ca2+	8.42	NH4+	11.47	H+	80.11	H2O	184	"
53	Ca2+	2.73	NH4+	20.72	H+	76.55	H2O	277	C
54	Ca2+	17.43	NH4+	2.91	H+	79.66	H2O	349	E
55	Ca2+	18.35	NH4+	2.94	H+	78.71	H2O	403	"
56	Ca2+	16.21	NH4+	5.62	H+	78.17	H2O	326	"
57	Ca2+	8.09	NH4+	17.41	H+	74.50	H2O	352	"
58	Ca2+	8.48	NH4+	17.42	H+	74.10	H2O	396	"
59	Ca2+	0.98	NH4+	31.84	H+	67.18	H2O	488	"
60	Ca2+	0.80	NH4+	32.20	H+	67.00	H2O	532	"
61	Ca2+	0.96	NH4+	32.54	H+	66.50	H2O	571	"
62	Ca2+	6.99	NH4+	14.13	H+	78.88	H2O	168	D
63	Ca2+	7.91	NH4+	13.20	H+	78.89	H2O	190	D
64	Ca2+	11.81	NH4+	9.31	H+	78.88	H2O	229	"
65	Ca2+	8.70	NH4+	13.10	H+	78.20	H2O	203	"
66	Ca2+	7.28	NH4+	14.85	H+	77.87	H2O	183	"
67	Ca2+	8.75	NH4+	13.60	H+	77.65	H2O	208	"
68	Ca2+	12.02	NH4+	10.60	H+	77.38	H2O	241	"
69	Ca2+	8.53	NH4+	14.59	H+	76.88	H2O	214	"
70	Ca2+	12.15	NH4+	10.97	H+	76.88	H2O	257	"
71	Ca2+	8.30	NH4+	15.70	H+	76.00	H2O	222	"
72	Ca2+	7.59	NH4+	16.58	H+	75.83	H2O	212	"
73	Ca2+	8.03	NH4+	18.02	H+	73.95	H2O	248	"

Part 2. The compiler has used the above data to calculate the following values.
Solution number	Chemical₁	Mass Fraction w₁	m₁ [mol/kg]	Chemical₂	Mass Fraction w₂	m₂ [mol/kg]	Chemical₃	Mass Fraction w₃	m₃ [mol/kg]	Chemical₄	Mass Fraction w₄
1	Ca3(PO4)2	0.00	0.00	(NH4)3PO4	16.05	9.41	H3PO4	72.51	64.67	H2O	11.44
2	Ca3(PO4)2	4.79	0.38	(NH4)3PO4	11.28	1.86	H3PO4	43.17	10.81	H2O	40.76
3	Ca3(PO4)2	9.43	0.53	(NH4)3PO4	4.06	0.48	H3PO4	29.53	5.29	H2O	56.98
4	Ca3(PO4)2	8.99	0.51	(NH4)3PO4	4.43	0.53	H3PO4	30.26	5.48	H2O	36.31
5	Ca3(PO4)2	4.06	0.22	(NH4)3PO4	10.73	1.23	H3PO4	26.60	4.63	H2O	58.61
6	Ca3(PO4)2	5.09	0.30	(NH4)3PO4	10.82	1.34	H3PO4	29.85	5.62	H2O	54.24
7	Ca3(PO4)2	----	----	(NH4)3PO4	12.45	25.37	H3PO4	84.26	261.3	H2O	2.29
8	Ca3(PO4)2	----	----	(NH4)3PO4	13.13	9.29	H3PO4	77.39	83.31	H2O	9.48
9	Ca3(PO4)2	0.18	0.04	(NH4)3PO4	15.56	7.28	H3PO4	69.93	49.79	H2O	14.33
10	Ca3(PO4)2	0.76	0.11	(NH4)3PO4	14.19	4.22	H3PO4	62.50	28.28	H2O	22.35
11	Ca3(PO4)2	1.16	0.12	(NH4)3PO4	12.75	2.78	H3PO4	55.31	18.34	H2O	30.78
12	Ca3(PO4)2	2.29	0.23	(NH4)3PO4	12.74	2.69	H3PO4	53.15	17.04	H2O	31.82
13	Ca3(PO4)2	3.60	0.31	(NH4)3PO4	11.82	2.13	H3PO4	47.32	12.95	H2O	37.26
14	Ca3(PO4)2	4.56	0.36	(NH4)3PO4	11.34	1.87	H3PO4	43.40	10.88	H2O	40.70
15	Ca3(PO4)2	4.50	0.36	(NH4)3PO4	11.45	1.90	H3PO4	43.69	11.05	H2O	40.36
16	Ca3(PO4)2	5.38	0.40	(NH4)3PO4	10.46	1.63	H3PO4	41.11	9.75	H2O	43.04
17	Ca3(PO4)2	5.69	0.40	(NH4)3PO4	9.57	1.40	H3PO4	38.97	8.69	H2O	45.77
18	Ca3(PO4)2	5.98	0.41	(NH4)3PO4	9.08	1.30	H3PO4	38.06	8.28	H2O	46.89
19	Ca3(PO4)2	7.52	0.48	(NH4)3PO4	6.65	0.88	H3PO4	34.89	6.99	H2O	50.94
20	Ca3(PO4)2	7.19	0.45	(NH4)3PO4	7.01	0.92	H3PO4	34.75	6.95	H2O	51.04
21	Ca3(PO4)2	7.77	0.48	(NH4)3PO4	6.18	0.79	H3PO4	33.77	6.59	H2O	52.28
22	Ca3(PO4)2	7.95	0.48	(NH4)3PO4	5.86	0.74	H3PO4	32.75	6.25	H2O	53.44
23	Ca3(PO4)2	8.94	0.51	(NH4)3PO4	4.46	0.53	H3PO4	30.55	5.56	H2O	56.05
24	Ca3(PO4)2	4.87	0.36	(NH4)3PO4	11.14	1.73	H3PO4	40.81	9.65	H2O	43.18
25	Ca3(PO4)2	4.95	0.37	(NH4)3PO4	11.25	1.76	H3PO4	40.81	9.69	H2O	42.99
26	Ca3(PO4)2	5.07	0.37	(NH4)3PO4	11.19	1.69	H3PO4	39.41	9.07	H2O	44.33
27	Ca3(PO4)2	5.06	0.36	(NH4)3PO4	11.16	1.64	H3PO4	38.03	8.48	H2O	45.75
28	Ca3(PO4)2	5.18	0.35	(NH4)3PO4	11.05	1.57	H3PO4	36.68	7.95	H2O	47.09
29	Ca3(PO4)2	5.29	0.35	(NH4)3PO4	11.01	1.50	H3PO4	34.62	7.20	H2O	49.07
30	Ca3(PO4)2	5.24	0.32	(NH4)3PO4	10.91	1.40	H3PO4	31.53	6.15	H2O	52.32
31	Ca3(PO4)2	4.97	0.29	(NH4)3PO4	11.01	1.33	H3PO4	28.42	5.22	H2O	55.59
49	Ca3(PO4)2	2.87	1.16	(NH4)3PO4	2.31	3.07	H3PO4	50.63	11.69	H2O	44.19
50	Ca3(PO4)2	1.33	0.738	(NH4)3PO4	4.272	7.790	H3PO4	62.15	19.67	H2O	32.24
51	Ca3(PO4)2	4.145	1.407	(NH4)3PO4	0.990	1.11	H3PO4	42.32	8.220	H2O	52.54
52	Ca3(PO4)2	3.41	1.30	(NH4)3PO4	2.817	3.553	H3PO4	47.16	10.33	H2O	46.61
53	Ca3(PO4)2	0.886	0.276	(NH4)3PO4	4.079	4.189	H3PO4	37.80	6.740	H2O	57.23
54	Ca3(PO4)2	4.920	1.422	(NH4)3PO4	0.498	0.475	H3PO4	32.89	5.439	H2O	61.70
55	Ca3(PO4)2	4.710	1.294	(NH4)3PO4	0.458	0.414	H3PO4	29.90	4.699	H2O	64.93
56	Ca3(PO4)2	4.765	1.416	(NH4)3PO4	1.00	0.982	H3PO4	34.24	5.825	H2O	59.99
57	Ca3(PO4)2	2.26	0.647	(NH4)3PO4	2.949	2.785	H3PO4	32.53	5.332	H2O	62.26
58	Ca3(PO4)2	2.19	0.602	(NH4)3PO4	2.733	2.474	H3PO4	30.13	4.734	H2O	64.94
59	Ca3(PO4)2	0.22	0.056	(NH4)3PO4	4.303	3.638	H3PO4	25.95	3.809	H2O	69.53
60	Ca3(PO4)2	0.17	0.042	(NH4)3PO4	4.093	3.373	H3PO4	24.41	3.492	H2O	71.33
61	Ca3(PO4)2	0.19	0.047	(NH4)3PO4	3.927	3.176	H3PO4	23.18	3.253	H2O	72.70
62	Ca3(PO4)2	2.95	1.18	(NH4)3PO4	3.613	4.789	H3PO4	49.10	11.30	H2O	44.34
63	Ca3(PO4)2	3.15	1.18	(NH4)3PO4	3.184	3.953	H3PO4	46.32	9.982	H2O	47.35
64	Ca3(PO4)2	4.264	1.472	(NH4)3PO4	2.04	2.32	H3PO4	42.06	8.311	H2O	51.64
65	Ca3(PO4)2	3.34	1.22	(NH4)3PO4	3.053	3.673	H3PO4	44.75	9.346	H2O	48.86
66	Ca3(PO4)2	2.94	1.13	(NH4)3PO4	3.639	4.616	H3PO4	47.07	10.36	H2O	46.35
67	Ca3(PO4)2	3.32	1.20	(NH4)3PO4	3.127	3.720	H3PO4	44.15	9.118	H2O	49.41
68	Ca3(PO4)2	4.209	1.423	(NH4)3PO4	2.252	2.510	H3PO4	40.79	7.892	H2O	52.75
69	Ca3(PO4)2	3.18	1.13	(NH4)3PO4	3.301	3.875	H3PO4	43.45	8.854	H2O	50.07
70	Ca3(PO4)2	4.102	1.347	(NH4)3PO4	2.247	2.432	H3PO4	39.34	7.390	H2O	54.31
71	Ca3(PO4)2	3.03	1.06	(NH4)3PO4	3.479	4.016	H3PO4	42.56	8.526	H2O	50.93
72	Ca3(PO4)2	2.84	1.02	(NH4)3PO4	3.762	4.439	H3PO4	43.58	8.924	H2O	49.82
73	Ca3(PO4)2	2.75	0.917	(NH4)3PO4	3.749	4.116	H3PO4	39.95	7.613	H2O	53.55

Notes:
   Table 1  ^a  The content is expressed as: mol/100 mol solute.
   Table 1  ^b  The solid phases are: A=(NH₄)₃H₉(PO₄)₄: B=NH₄H₂PO₄; C=Ca(H₂PO₄)₂·H₂O; D=Ca₉(NH₄)₄H₃₂(PO₄)₁₈·10H₂O; E=CaHPO₄·2H₂O.
   Table 1  ^c  These values were obtained by direct determination and by extrapolation.
   Table 1  ^d  These values were obtained by direct determination in solutions supersaturated with CaHPO₄·2H₂O. All other data were obtained by interpolation.
   Table 3  ^a  The content is expressed as: mol/100 mol solute.
   Table 3  ^b  The solid phases are: A=Ca(H₂PO₄)₂H₂O; B=NH₄H₅(PO₄)₂; C=NH₄H₂PO₄; D=Ca₉(NH₄)₄H₃₂(PO₄)₁₈·10H₂O; E=CaHPO₄·2H₂O.
   Table 3  ^c  These solutions were supersaturated with CaHPO₄·2H₂O.

Method/Apparatus/Procedure:
   No information is given.

Source and Purity of Materials:
   No information is given.

Estimated Errors:

   Temperature: No information is given. The compiler estimates the reproducibility to be about 1 %.