IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Ammonia with Nitric acid, 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) Nitric acid; HNO3; [7697-37-2]  NIST Chemistry WebBook for detail
   (4) Phosphoric acid; H3PO4; [7664-38-2]  NIST Chemistry WebBook for detail
   (5) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Flatt, R.; Brunisholz, G.; Lauber, E., Helv. Chim. Acta 1953, 36, 1971.

Variables:

   Concentration = Composition at 0 ºC, 25 ºC and 50 ºC.

Prepared By:
   J. Eysseltová

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

Part 1. The authors' data
Composition of saturated solutions coexisting with Ca(H₂PO₄)₂·H₂O, NH₄H₂PO₄ and Ca₉(NH₄)₄H₃₂(PO
Solution number	t/°C	Chemical₁	Solubility₁ [eq %]	Chemical₂	Solubility₂ [eq %]	Chemical₃	Solubility₃ [eq %]	Chemical₄	Solubility₄ [eq %]	Chemical₅	Solubility₅ [eq %]	Chemical₆	Mole Fraction₆^{eq %}	Solid Phase(s)^(b)
1	0	Ca2+	8.45	NH4+	10.93	H+	80.62	NO3-	0.00	PO43-	100.00	H2O	196.5	A + B + C
2	0	Ca2+	15.18	NH4+	16.53	H+	68.29	NO3-	14.73	PO43-	85.27	H2O	239.1	"
3	0	Ca2+	22.56	NH4+	24.10	H+	53.34	NO3-	33.46	PO43-	66.54	H2O	264.6	"
4	0	Ca2+	29.90	NH4+	35.01	H+	35.09	NO3-	56.35	PO43-	43.65	H2O	265.2	"
5	0	Ca2+	32.94	NH4+	42.09	H+	24.97	NO3-	69.14	PO43-	30.86	H2O	244.2	"
6	0	Ca2+	34.33	NH4+	48.05	H+	17.62	NO3-	78.30	PO43-	21.70	H2O	223.8	A + B + C + D
7	25	Ca2+	5.64	NH4+	13.83	H+	80.53	NO3-	0.00	PO43-	100.00	H2O	137.8	A + B + C
8	25	Ca2+	6.37	NH4+	14.88	H+	78.75	NO3-	2.22	PO43-	97.78	H2O	140.8	"
9	25	Ca2+	7.45	NH4+	16.76	H+	75.79	NO3-	6.09	PO43-	93.91	H2O	148.4	"
10	25	Ca2+	8.60	NH4+	18.47	H+	72.93	NO3-	9.60	PO43-	90.40	H2O	150.6	"
11	25	Ca2+	9.98	NH4+	21.12	H+	68.90	NO3-	14.57	PO43-	85.43	H2O	158.6	"
12	25	Ca2+	11.18	NH4+	23.35	H+	65.47	NO3-	19.35	PO43-	80.65	H2O	162.5	"
13	25	Ca2+	14.86	NH4+	31.60	H+	53.54	NO3-	34.39	PO43-	65.61	H2O	175.4	"
14	25	Ca2+	16.80	NH4+	36.18	H+	47.02	NO3-	42.96	PO43-	57.04	H2O	176.3	"
15	25	Ca2+	17.56	NH4+	38.81	H+	43.63	NO3-	46.90	PO43-	53.10	H2O	173.8	"
16	25	Ca2+	19.82	NH4+	45.58	H+	34.60	NO3-	57.92	PO43-	42.08	H2O	169.6	"
17	25	Ca2+	20.59	NH4+	50.39	H+	29.02	NO3-	64.00	PO43-	36.00	H2O	158.8	"
18	25	Ca2+	21.15	NH4+	54.06	H+	24.79	NO3-	70.57	PO43-	29.43	H2O	147.5	"
19	25	Ca2+	21.55	NH4+	56.54	H+	21.91	NO3-	73.78	PO43-	26.22	H2O	143.3	A + B + C + D
20	50	Ca2+	4.08	NH4+	16.15	H+	79.77	NO3-	0.00	PO43-	100.00	H2O	92.6	A + B + C
21	50	Ca2+	7.20	NH4+	25.08	H+	67.72	NO3-	16.19	PO43-	83.81	H2O	97.6	"
22	50	Ca2+	9.54	NH4+	37.14	H+	53.32	NO3-	34.93	PO43-	65.07	H2O	105.1	"
23	50	Ca2+	12.79	NH4+	53.45	H+	33.76	NO3-	59.05	PO43-	40.95	H2O	96.9	"

Part 2. The compiler has used the data in Part 1 to calculate the following concentration values. Values expressed as 100w_i.
Solution number	Chemical₁	10² * Mass Fraction w₁	Chemical₂	10² * Mass Fraction w₂	Chemical₃	10² * Mass Fraction w₃	Chemical₄	10² * Mass Fraction w₄	Chemical₅	10² * Mass Fraction w₅	Chemical₆	10² * Mass Fraction w₆
1	Ca2+	2.36	NH4+	2.59	H+	1.12	NO3-	0.00	PO43-	44.61	H2O	49.31
2	Ca2+	3.53	NH4+	3.27	H+	0.79	NO3-	10.78	PO43-	31.67	H2O	49.96
3	Ca2+	4.56	NH4+	4.14	H+	0.54	NO3-	21.26	PO43-	21.47	H2O	48.03
4	Ca2+	5.47	NH4+	5.44	H+	0.32	NO3-	32.42	PO43-	12.75	H2O	43.59
5	Ca2+	5.92	NH4+	6.43	H+	0.22	NO3-	39.11	PO43-	8.86	H2O	39.45
6	Ca2+	6.15	NH4+	7.32	H+	0.16	NO3-	44.13	PO43-	6.21	H2O	36.03
7	Ca2+	1.85	NH4+	3.86	H+	1.32	NO3-	0.00	PO43-	52.38	H2O	40.60
8	Ca2+	2.04	NH4+	4.05	H+	1.26	NO3-	2.23	PO43-	49.96	H2O	40.47
9	Ca2+	2.27	NH4+	4.34	H+	1.15	NO3-	5.84	PO43-	45.74	H2O	40.65
10	Ca2+	2.55	NH4+	4.65	H+	1.08	NO3-	8.94	PO43-	42.74	H2O	40.05
11	Ca2+	2.80	NH4+	5.04	H+	0.97	NO3-	12.87	PO43-	38.31	H2O	40.01
12	Ca2+	3.02	NH4+	5.36	H+	0.88	NO3-	16.45	PO43-	34.82	H2O	39.46
13	Ca2+	3.58	NH4+	6.47	H+	0.64	NO3-	26.07	PO43-	25.25	H2O	37.98
14	Ca2+	3.87	NH4+	7.08	H+	0.54	NO3-	31.10	PO43-	20.97	H2O	36.45
15	Ca2+	3.98	NH4+	7.48	H+	0.49	NO3-	33.44	PO43-	19.22	H2O	35.39
16	Ca2+	4.29	NH4+	8.38	H+	0.37	NO3-	39.43	PO43-	14.55	H2O	32.98
17	Ca2+	4.42	NH4+	9.18	H+	0.31	NO3-	43.17	PO43-	12.33	H2O	30.59
18	Ca2+	4.50	NH4+	9.78	H+	0.26	NO3-	47.24	PO43-	10.00	H2O	28.20
19	Ca2+	4.55	NH4+	10.15	H+	0.23	NO3-	49.02	PO43-	8.85	H2O	27.20
20	Ca2+	1.54	NH4+	5.19	H+	1.50	NO3-	0.00	PO43-	60.34	H2O	31.43
21	Ca2+	2.37	NH4+	7.00	H+	1.11	NO3-	16.73	PO43-	43.98	H2O	28.81
22	Ca2+	2.71	NH4+	8.97	H+	0.76	NO3-	31.21	PO43-	29.53	H2O	26.83
23	Ca2+	3.21	NH4+	11.41	H+	0.42	NO3-	46.66	PO43-	16.43	H2O	21.87

The following values are expressed as m₁/ mol kg^–1.
Solution number	Chemical₁	m₁ [mol/kg]	Chemical₂	m₂ [mol/kg]	Chemical₃	m₃ [mol/kg]	Chemical₄	m₄ [mol/kg]	Chemical₅	m₅ [mol/kg]
1	Ca2+	1.19	NH4+	3.09	H+	22.79	NO3-	0.00	PO43-	9.42
2	Ca2+	1.76	NH4+	3.84	H+	15.87	NO3-	3.42	PO43-	6.60
3	Ca2+	2.37	NH4+	5.06	H+	11.20	NO3-	7.03	PO43-	4.66
4	Ca2+	3.13	NH4+	7.33	H+	7.35	NO3-	11.80	PO43-	3.05
5	Ca2+	3.75	NH4+	9.58	H+	5.68	NO3-	15.73	PO43-	2.34
6	Ca2+	4.26	NH4+	11.93	H+	4.37	NO3-	19.44	PO43-	1.80
7	Ca2+	1.14	NH4+	5.38	H+	32.47	NO3-	0.00	PO43-	13.44
8	Ca2+	1.26	NH4+	5.87	H+	31.07	NO3-	0.88	PO43-	12.86
9	Ca2+	1.39	NH4+	6.27	H+	28.37	NO3-	2.28	PO43-	11.72
10	Ca2+	1.59	NH4+	6.81	H+	26.90	NO3-	3.54	PO43-	11.12
11	Ca2+	1.75	NH4+	7.40	H+	24.13	NO3-	5.10	PO43-	9.98
12	Ca2+	1.91	NH4+	7.98	H+	22.38	NO3-	6.62	PO43-	9.19
13	Ca2+	2.35	NH4+	10.01	H+	16.96	NO3-	10.89	PO43-	6.93
14	Ca2+	2.65	NH4+	11.40	H+	14.82	NO3-	13.54	PO43-	5.99
15	Ca2+	2.81	NH4+	12.41	H+	13.95	NO3-	14.99	PO43-	5.66
16	Ca2+	3.25	NH4+	14.93	H+	11.33	NO3-	18.97	PO43-	4.59
17	Ca2+	3.60	NH4+	17.63	H+	10.15	NO3-	22.39	PO43-	4.20
18	Ca2+	3.98	NH4+	20.36	H+	9.34	NO3-	26.58	PO43-	3.69
19	Ca2+	4.18	NH4+	21.92	H+	8.49	NO3-	28.60	PO43-	3.39
20	Ca2+	1.22	NH4+	9.69	H+	47.86	NO3-	0.00	PO43-	20.00
21	Ca2+	2.05	NH4+	14.28	H+	38.55	NO3-	9.22	PO43-	15.90
22	Ca2+	2.52	NH4+	19.63	H+	28.18	NO3-	18.46	PO43-	11.47
23	Ca2+	3.67	NH4+	30.64	H+	19.36	NO3-	33.86	PO43-	7.83

Notes:
   Table 1  ^a  The water content is expressed as mol/100 mol solute.
   Table 1  ^b  The solid phases are: A=Ca(H₂PO₄)₂·H₂O; B=NH₄H₂PO₄; C=Ca₉(NH₄)₄H₃₂(PO₄)₁₈·10H₂O; D=NH₄NO₃

Method/Apparatus/Procedure:
   The eutonic solution existing in equilibrium with 3 salts--Ca(H₂PO₄)₂·H₂O, NH₄H₂PO₄ and Ca₉ (NH₄)₄H₃₂(PO₄)₁₈·10H₂O--was prepared and saturated with NH₄NO₃. The system was stirred in a thermostat and examined petrographically. When all the desired phases were present, the stirring was interrupted and the system was equilibrated for at least 3 weeks. The satd soln was analyzed for Ca²⁺, NH₄⁺, H⁺, NO₃^– and PO₄^3–. The analytical methods are not described.

Source and Purity of Materials:
   No information is given.

Estimated Errors:

   Temperature: The only information given is that the temperature 273 K was kept constant within ±0.1 K.