SDS Volume (2982)
Volume 66. Ammonium Phosphates, p None
Original Measurements
Volkov, A. A.; Sosnina, O. E.; Izv. Vuzov. Khim. Khim. Tekhnol. 1974, 17, 1725.
Variables:
Room Temp: Composition at 20 °C
Prepared by:
Method/Apparatus/Procedure:
The isothermal method of sections (1, 2) was used with the aid of refractive index measurements. Seven sections were studied.
Source and Purity of Materials:
- Chemically pure $\ce{H3PO4}$, recrystallized ammonium phosphates, and reagent grade $\ce{NH4Cl}$ were used. $\ce{(NH4)3PO4}$ was synthesized according to the method of Schottlander (no details given). Its solubility was 12.8%.
Estimated Errors:
Ambient temperature: No information is given.
Mass concentration (m/v) (1): No information is given.
References
1
Mertslin, R. V.; Izv. Perm. Biol. Inst. 11, 1 (1937).
2
Zhuravlev, E. F.; Sheveleva, A. D. Zh. Neorg. Khim. 1960, 5, 2630.
Components:
- Ammonia, $\ce{ NH3 }$; [7664-41-7] NIST WebBook
- Phosphoric acid, $\ce{ H3PO4 }$; [7664-38-2] NIST WebBook
- Hydrogen chloride, $\ce{ HCl }$; [7647-01-0] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
Table 2. Compilers Data.
| 100w1 | 100w2 | w3 | 100w4 | m1 (mol/kg) | m2 (mol/kg) | m3 (mol/kg) |
|---|---|---|---|---|---|---|
| 10.4 | 29.0 | 0 | 60.5 | 10.1 | 4.90 | 0 |
| 12.3 | 46.1 | 0 | 41.6 | 17.3 | 11.3 | 0 |
| 5.53 | 81.2 | 0 | 13.3 | 24.4 | 62.3 | 0 |
| 4.46 | 84.0 | 0 | 11.5 | 22.8 | 74.6 | 0 |
| 1.41 | 77.6 | 10.3 | 10.7 | 7.76 | 74.3 | 26.5 |
| 2.96 | 79.2 | 6.33 | 11.5 | 15.1 | 70.3 | 15.1 |
| 6.97 | 90.4 | 2.59 | 0 | xxx | xxx | xxx |
| 6.61 | 38.1 | 9.31 | 46.0 | 8.43 | 8.44 | 5.55 |
| 7.11 | 20.8 | 12.6 | 59 | 7.02 | 3.57 | 5.79 |
| 7.25 | 20.8 | 13.0 | 59.0 | 7.22 | 3.59 | 6.03 |
| 7.51 | 10.6 | 14.4 | 67.5 | 6.54 | 1.60 | 5.86 |
| 8.63 | 3.82 | 17.1 | 70.5 | 7.19 | 0.552 | 6.63 |
| 10.8 | 17.0 | 13.7 | 58.5 | 10.8 | 2.97 | 6.40 |
| 12.5 | 36.0 | 5.56 | 46.0 | 15.9 | 7.98 | 3.31 |
| 12.1 | 28.6 | 9.24 | 50.0 | 14.3 | 5.84 | 5.07 |
| 10.4 | 16.9 | 11.7 | 61.0 | 10.0 | 2.82 | 5.27 |
| 10.4 | 9.31 | 15.3 | 65.0 | 9.39 | 1.46 | 6.45 |
| 10.2 | 4.60 | 16.7 | 68.5 | 8.74 | 0.685 | 6.69 |
| 11.0 | 8.29 | 15.6 | 65.2 | 9.86 | 1.30 | 6.54 |
| 9.73 | 16.6 | 7.63 | 66.0 | 8.66 | 2.57 | 3.17 |
| 10.1 | 22.1 | 4.74 | 63.0 | 9.45 | 3.58 | 2.06 |
(a) The solid phases are: A = (NH4)3PO4·3H2O; B = (NH4)2HPO4; C = NH4H2PO4; D = 3NH4H2PO4·H3PO4; E = NH4H2PO4·H3PO4; F = NH4Cl.
(b) In this solution, 0.073 w (presumably of solute-compiler) HCl was present.
(a) The molalities could not be calculated because the respective liquid phase was anhydrous.
