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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Ammonia with Phosphoric acid, Hydrogen chloride and Water
Components:
(1) Ammonia; NH3; [7664-41-7]
NIST Chemistry WebBook
for detail
(2) Hydrogen chloride; HCl; [7647-01-0]
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
Evaluator:
J. Eysseltová; Charles University; Prague, Czech Republic (September 1995)
Critical Evaluation:
5.3.Solubility in the NH
3
-H
3
PO
4
-HCl-H
2
O system
There is only one report
1
that presents data about the composition of solutions on the boundaries of the crystallization fields of this system. Another article
2
describes the system as comprising NH
4
H
2
PO
4
, (NH
4
)
2
HPO
4
, HCl and H
2
O as components at a NH
3
/H
3
PO
4
ratio = 1.2. A visual comparison
3
of the projections of the 293 K isotherm reported in Ref. 1 and the polytherm reported in Ref. 2 shows an intersection at a position which appears to be reasonable so far as the composition of the saturated solutions and the temperature are concerned. Therefore, these data are accepted tentatively.
There is a report of solubility data for that part of the quinary system NH
3
-H
3
PO
4
-HCl-K
2
O-H
2
O where H
3
PO
4
/N > 1.
4
However, these data cannot be critically evaluated because of lack of other similar data. To a limited extent the data can be compared with those for the NH
4
H
2
PO
4
-KCl-H
2
O and (NH
4
)
2
HPO
4
-KCl-H
2
O systems.
5,7
It is difficult to compare these data with each other because of different experimental conditions, but they will be discussed further in connection with the NH
4
+
, K
+
|| H
2
PO
4
–
, Cl
–
- H
2
O system (see pp 1366-1369, 1376).
Experimental Data:
(Notes on the Nomenclature)
References: (Click a link to see its experimental data associated with the reference)
1
Volkov, A.A.; Sosnina, O.E., Izv. Vuzov. Khim. Khim. Tekhnol. 1974, 17, 1725.
2
Grantscharov, I.N., Dokl. Bolg. Akad. Nauk 1976, 29, 669.
3 Eysseltová, J., to be published.
4 Polosin, V.A.; Shakhparonov, M.I., Zh. Fiz. Khim. 21, 119 (1947).
5 Karshev, I.; Asitska, K., God. na VKhTI, Sofiya 1970, 101.
6
Baranova, T.N.; Semkin, N.T.; Kim, P.P.; Kornishina, E.N.; Nikandrov, I.S., Tekhnologiya Mineral'nykh Udobreniy (Leningrad) 1977, 55.
7 Fokina, Z.N.; Kornishina, E.N.; Kim, P.P., Tekhnologiya Mineral'nykh Udobreniy (Leningrad) 63 (1977).