SDS Volume (2965)
Volume 66. Ammonium Phosphates, p None
Original Measurements
Flatt, R.; Brunisholz, G.; Chapuis-Gottreux, S.; Helv. Chim. Acta 1951, 34, 884.
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. The compiler estimates the reproducibility to be about 1%.
Components:
- Ammonia, $\ce{ NH3 }$; [7664-41-7] 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 II. Solutions coexisting with two solid phases in the (NH4)3PO4-Ca3(PO4)2-H3PO4-H2O system at 25°C.
| $100 x_{4} (\rm{solutes})$ | $100 x_{3}$ | $100 x_{1}$ | $100 x_{2}$ | Phase (s) () |
|---|---|---|---|---|
| 6.46 | traces | 8.85 | 91.15 | A + B |
| 20.0 | traces | 10.03 | 89.97 | A + B |
| 32.4 | 0.14 | 12.74 | 87.12 | A + C |
| 56.6 | 0.66 | 12.90 | 86.44 | A + C |
| 86.7 | 1.14 | 13.01 | 85.85 | A + C |
| 91.7 | 2.30 | 13.30 | 84.40 | A + C |
| 118 | 3.92 | 13.58 | 82.50 | A + C |
| 137.5 | 5.36 | 13.87 | 80.77 | A + C |
| 135.5 | 5.26 | 13.92 | 80.82 | A + C |
| 159 | 6.62 | 13.38 | 80.0 | A + D |
| 1.7E+2 | 7.36 | 12.87 | 79.77 | A + D |
| 178 | 7.90 | 12.48 | 79.62 | A + D |
| 2.1E+2 | 10.79 | 9.93 | 79.25 | A + D |
| 211 | 10.35 | 10.50 | 79.15 | A + D |
| 222 | 11.49 | 9.50 | 79.01 | A + D |
| 233 | 12.07 | 9.25 | 78.68 | A + D |
| 2.6E+2 | 14.43 | 7.50 | 78.07 | A + D |
| 153 | 6.01 | 14.30 | 79.69 | C + D |
| 152 | 6.09 | 14.41 | 79.50 | C + D |
| 161 | 6.41 | 14.72 | 78.87 | C + D |
| 171 | 6.58 | 15.11 | 78.31 | C + D |
| 181 | 6.93 | 15.38 | 77.69 | C + D |
| 197 | 7.40 | 16.01 | 76.59 | C + D |
| 226 | 7.88 | 17.07 | 75.05 | C + D |
| 2.6E+2 | 8.10 | 18.65 | 73.25 | C + D |
| 298 | 17.15 | 4.04 | 78.81 | A + E |
| 298 | 18.85 | 3.19 | 77.96 | A + E |
| 342 | 17.90 | 2.70 | 79.40 | A + E |
| 2.6E+2 | 11.55 | 12.05 | 76.40 | D + E |
| 314 | 11.62 | 14.74 | 73.64 | D + E |
| 314 | 10.31 | 16.69 | 73.00 | D + E |
| 274 | 7.01 | 19.58 | 73.41 | C + E |
| 294 | 6.13 | 20.73 | 74.14 | C + E |
| 349 | 4.70 | 23.80 | 71.50 | C + E |
| 364 | 4.58 | 23.91 | 71.51 | C + E |
| 409 | 3.95 | 26.44 | 69.61 | C + E |
| 452 | 2.15 | 30.02 | 67.83 | C + E |
| 504 | 2.01 | 30.90 | 67.09 | C + E |
| 494 | 0.81 | 32.32 | 66.87 | C + E |
| 353 | 0.38 | 39.32 | 60.30 | C + E |
(a) The content is expressed as: mol/100 mol solute.
(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.
(c) These values were obtained by direct determination and by extrapolation.
(d) These values were obtained by direct determination in solutions supersaturated with CaHPO4·2H2O. All other data were obtained by interpolation.
(a) The content is expressed as: mol/100 mol solute.
(b) The solid phases are: A = Ca(H2PO4)2H2O; C = NH4H2PO4; D = Ca9(NH4)4H32(PO4)18·10H2O; E = CaHPO4·2H2O.
(c) These solutions were supersaturated with CaHPO4·2H2O.
(a) The content is expressed as: mol/100 mol solute.
(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.
