Compilation - Ammonia with Nitric acid, Phosphoric acid, Calcium oxide and Water (IUPAC SDS Volume 66)
SDS Volume (2969)
Volume 66. Ammonium Phosphates, p None
Original Measurements
Flatt, R.; Brunisholz, G.; Clerc, F.; Helv. Chim. Acta 1952, 35, 336.
Variables:
Room Temp: Composition at 25 °C
Prepared by:
Method/Apparatus/Procedure:
No information is given.
Source and Purity of Materials:
- No information is given.
Estimated Errors:
Ambient temperature: No information is given.
Mass concentration (m/v) (1): No information is given.
Components:
- Ammonia, $\ce{ NH3 }$; [7664-41-7] NIST WebBook
- Nitric acid, $\ce{ HNO3 }$; [7697-37-2] NIST WebBook
- Phosphoric acid, $\ce{ H3PO4 }$; [7664-38-2] NIST WebBook
- Calcium oxide, $\ce{ CaO }$; [1305-78-8] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
Table I. Solutions coexisting with Ca(H2PO4)2·H2O and NH4H2PO4.
| $100 x_{5} (\rm{solutes})$ | $100 x_{4} (\rm{solutes})$ | $100 x_{1} (\rm{solutes})$ | $100 x_{\ce{H+}}$ | $100 x_{2} (\rm{solutes})$ | $100 x_{3} (\rm{solutes})$ |
|---|---|---|---|---|---|
| 173.2 | 19.3 | 44.0 | 36.7 | 55.4 | 44.6 |
| 206.2 | 18.5 | 41.2 | 40.3 | 49.9 | 50.1 |
| 106.0 | 8.5 | 32.9 | 58.6 | 33.2 | 66.8 |
| 160.0 | 13.0 | 28.8 | 58.2 | 29.1 | 70.9 |
| 57.8 | 5.1 | 27.0 | 67.9 | 23.0 | 77.0 |
| 96.5 | 7.8 | 26.4 | 65.8 | 23.5 | 76.5 |
(a) The content is expressed as: mol/100 mol solute.
(b) The solid phases are: A = Ca(H2PO4)2·H2O; B = NH4H2PO4; C = NH4NO3; D = (NH4)3H9(PO4)4; E = Ca9(NH4)4H32(PO4)18·10H2O;
(c) This was a metastable equilibrium.
