Compilation - Diammonium hydrogenphosphate with Urea, Ammonium nitrate and Water (IUPAC SDS Volume 66)
SDS Volume (2905)
Volume 66. Ammonium Phosphates, p None
Original Measurements
Tudorovskaya, G. L.; Margolis, F. G.; Khim. Prom. 1966, 42, 678.
Variables:
Room Temp: Composition at 50 °C
Prepared by:
Method/Apparatus/Procedure:
An isothermal method was used. Equilibrium was checked by repeated analysis.
Source and Purity of Materials:
- No information is given.
Estimated Errors:
Ambient temperature: The temperature was kept constant to within 0.1 K.
Mass concentration (m/v) (1): No information given.
Components:
- Diammonium hydrogenphosphate, $\ce{ (NH4)2HPO4 }$; [7783-28-0] NIST WebBook
- Urea, $\ce{ CH4N2O }$; [57-13-6] NIST WebBook
- Ammonium nitrate, $\ce{ NH4NO3 }$; [6484-52-2] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
Part 1. Solubility in the (NH4)2HPO4-NH4NO3-CO(NH2)2-H2O system at 50°C
| 100w1 | 100w2 | 100w3 | 100w4 | m1 (mol/kg) | m2 (mol/kg) | m3 (mol/kg) | Phase (s) () |
|---|---|---|---|---|---|---|---|
| 0.000 | 67.95 | 4.12 | 27.93 | 0.000 | 30.39 | 1.12 | A + B |
| 9.44 | 65.77 | 2.80 | 21.99 | 7.15 | 37.36 | 0.964 | A + B |
| 16.65 | 62.59 | 1.65 | 19.11 | 14.51 | 40.92 | 0.654 | A + B |
| 29.86 | 58.77 | 1.47 | 9.90 | 50.22 | 74.16 | 1.12 | A + B |
| 38.74 | 51.00 | 1.20 | 9.06 | 71.19 | 70.32 | 1.00 | A + B |
| 46.50 | 52.08 | 1.42 | XX | XX | XX | A + B | |
| 48.80 | 49.35 | 1.85 | XX | XX | XX | B + C | |
| 49.70 | 41.30 | 1.20 | 7.80 | 106.09 | 66.14 | 1.16 | B + C |
| 53.41 | 26.20 | 1.96 | 18.43 | 48.25 | 17.76 | 0.805 | B + C |
| 56.54 | 19.32 | 2.06 | 22.08 | 42.64 | 10.93 | 0.706 | B + C |
| 60.96 | 9.37 | 2.76 | 26.91 | 37.72 | 4.35 | 0.777 | B + C |
| 61.00 | 5.61 | 3.60 | 29.79 | 34.09 | 2.35 | 0.915 | B + C |
| 62.77 | 0.000 | 7.82 | 29.41 | 35.54 | 0.000 | 2.01 | B + C |
| 0.000 | 77.05 | 0.000 | 22.95 | 0.000 | 41.94 | 0.000 | A |
| 66.52 | 0.000 | 0.000 | 33.48 | 33.08 | 0.000 | 0.000 | C |
| 0.000 | 0.000 | 46.50 | 53.50 | 0.000 | 0.000 | 6.58 | B |
(a) The molalities were calculated by the compiler.
(b) The solid phases are: A = NH4NO3; B = (NH4)2HPO4; C = CO(NH2)2.
(c) The molalities designated as XX cannot be calculated because the solutions are anhydrous.
(a) The authors state that the composition unit is g H2O/100 g solute. The compiler's opinion is that this is a typographical error and the composition unit is g/100 g solute.
