IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: Ammonia with Phosphoric acid, Hydrogen chloride and Water

   (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

   J. Eysseltová; Charles University; Prague, Czech Republic (September 1995)

Critical Evaluation:

5.3.Solubility in the NH3-H3PO4-HCl-H2O system

          There is only one report1 that presents data about the composition of solutions on the boundaries of the crystallization fields of this system. Another article2 describes the system as comprising NH4H2PO4, (NH4)2HPO4, HCl and H2O as components at a NH3/H3PO4 ratio = 1.2. A visual comparison3 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 NH3-H3PO4-HCl-K2O-H2O where H3PO4/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 NH4H2PO4-KCl-H2O and (NH4)2HPO4-KCl-H2O 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 NH4+, K+ || H2PO4, Cl - H2O 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).