SDS Volume (2888)
Volume 66. Ammonium Phosphates, p None
Original Measurements
Bergman, A. G.; Bochkarev, P. F.; Izv. Akad. Nauk USSR, Otd. Mat. Estestv. Nauk 237-266 (1938).
Bochkarev, P. F.; Tr. Vostoch. -Sibir. Gosud. Inst. 3-22 (1935).
Variables:
Temperature and composition.
Prepared by:
Method/Apparatus/Procedure:
A visual polythermic method was used.
Source and Purity of Materials:
- Chemically pure materials were recrystallized before use.
Estimated Errors:
Ambient temperature: No information is given.
Mass concentration (m/v) (1): No information is given.
Components:
- Ammonium dihydrogenphosphate, $\ce{ NH4H2PO4 }$; [7722-76-1] NIST WebBook
- Ammonium nitrate, $\ce{ NH4NO3 }$; [6484-52-2] NIST WebBook
- Potassium dihydrogenphosphate, $\ce{ KH2PO4 }$; [7778-77-0] NIST WebBook
- Potassium nitrate, $\ce{ KNO3 }$; [7757-79-1] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
Remarks: NOTE: The above data are given in both source papers, but source paper (2) also contains data for the composition of solutions in equilibrium with two or three solid phases. These data are given below.
Solubility in the NH4H2PO4-KNO3-H2O system.
| $T$ (°C) | 100w1 | 100w2 | 100w3 | $100 x_{1} (\rm{solutes})$ (mol/100 mol) | $100 x_{2} (\rm{solutes})$ (mol/100 mol) | $100 x_{3} (\rm{solutes})$ (mol/100 mol) | m1 (mol/kg) | m2 (mol/kg) | Phase (s) () |
|---|---|---|---|---|---|---|---|---|---|
| 0 | 18.4 | 0.0 | 81.6 | 1E+2 | 0 | 2.832 x 103 | 2.0 | 0.0 | A |
| 0 | 17.2 | 5 | 77.8 | 75.1 | 24.9 | 2.17 x 103 | 1.9 | 0.6 | A |
| 0 | 15.8 | 8.4 | 75.8 | 62.3 | 37.7 | 1.909 x 103 | 1.8 | 1.1 | A |
| 0 | 13.7 | 11.6 | 74.7 | 49.1 | 50.9 | 1.773 x 103 | 1.6 | 1.5 | A + B |
| 0 | 11.6 | 11.5 | 76.9 | 53 | 47 | 1.99 x 103 | 1.3 | 1.5 | B |
| 0 | 5.4 | 11.4 | 83.2 | 29.4 | 70.6 | 2.892 x 103 | 0.6 | 1.4 | B |
| 0 | 0.0 | 11.2 | 88.8 | 0 | 1E+2 | 4.448 x 103 | 0.0 | 1.2 | B |
| 10 | 21.3 | 0.0 | 78.7 | 1E+2 | 0 | 2.36 x 103 | 2.4 | 0.0 | A |
| 10 | 20.4 | 4.8 | 74.8 | 78.9 | 21.1 | 1.847 x 103 | 2.4 | 0.6 | A |
| 10 | 19.0 | 8.0 | 73.0 | 67.6 | 32.4 | 1.658 x 103 | 2.3 | 1.1 | A |
| 10 | 16.4 | 11.7 | 71.9 | 55.2 | 44.8 | 1.546 x 103 | 2.0 | 1.6 | A |
| 10 | 15.3 | 13.4 | 71.3 | 50.1 | 49.9 | 1.491 x 103 | 1.9 | 1.9 | A |
| 10 | 13.0 | 16.1 | 70.9 | 41.5 | 58.5 | 1.445 x 103 | 1.6 | 2.2 | A + B |
| 10 | 11 | 16.0 | 73.0 | 37.6 | 62.4 | 1.596 x 103 | 1.3 | 2.2 | B |
| 10 | 5.1 | 16.2 | 78.7 | 21.7 | 78.3 | 2.136 x 103 | 0.6 | 2.0 | B |
| 10 | 0.0 | 16.6 | 83.4 | 0 | 1E+2 | 2.819 x 103 | 0.0 | 2.0 | B |
| 20 | 25.5 | 0.0 | 74.5 | 1E+2 | 0 | 1.866 x 103 | 3.0 | 0.0 | A |
| 20 | 24.0 | 4.5 | 71.5 | 82.6 | 17.6 | 1.568 x 103 | 2.9 | 0.6 | A |
| 20 | 22.5 | 7.7 | 69.8 | 80.79 | 19.21 | 1.681 x 103 | 2.8 | 1.1 | A |
| 20 | 2E+1 | 11.2 | 68.8 | 61.1 | 38.9 | 1.342 x 103 | 2.5 | 1.6 | A |
| 20 | 17 | 14.8 | 68.2 | 50.2 | 49.8 | 1.287 x 103 | 2.2 | 2.1 | A |
| 20 | 15.2 | 17.0 | 67.8 | 44 | 56.0 | 1.253 x 103 | 1.9 | 2.5 | A |
| 20 | 11.8 | 21.8 | 66.4 | 32.2 | 67.8 | 1.159 x 103 | 1.5 | 3.2 | A + B |
| 20 | 10.2 | 21.7 | 68.1 | 29.2 | 70.8 | 1.247 x 103 | 1.3 | 3.2 | B |
| 20 | 4.7 | 22.4 | 72.9 | 15.5 | 84.5 | 1.542 x 103 | 0.6 | 3.0 | B |
| 20 | 0.0 | 23.0 | 77.0 | 0 | 1E+2 | 1.781 x 103 | 0.0 | 3.0 | B |
| 30 | 30.2 | 0.0 | 69.8 | 1E+2 | 0 | 1.475 x 103 | 3.8 | 0.0 | A |
| 30 | 27.5 | 4.4 | 68.1 | 84.6 | 15.4 | 1.338 x 103 | 3.5 | 0.6 | A |
| 30 | 26.0 | 7.3 | 66.7 | 75.8 | 24.2 | 1.242 x 103 | 3.4 | 1.1 | A |
| 30 | 23.9 | 10.6 | 65.5 | 66.5 | 33.5 | 1.163 x 103 | 3.2 | 1.6 | A |
| 30 | 19.2 | 16.2 | 64.6 | 51 | 49.0 | 1.096 x 103 | 2.6 | 2.5 | A |
| 30 | 15.4 | 21.1 | 63.5 | 39.1 | 60.9 | 1.045 x 103 | 2.1 | 3.3 | A |
| 30 | 10.6 | 27.0 | 62.4 | 25.6 | 74.4 | 964 | 1.5 | 4.3 | A + B |
| 30 | 9.5 | 27.2 | 63.3 | 23.5 | 76.5 | 1 x 103 | 1.3 | 4.2 | B |
| 30 | 4.3 | 29.0 | 66.7 | 11.5 | 88.5 | 1.142 x 103 | 0.6 | 4.3 | B |
| 30 | 0.0 | 31.0 | 69.0 | 0 | 1E+2 | 1.249 x 103 | 0.0 | 4.4 | B |
(a) The composition unit is: mol/100 mol solute.
(b) The molalities were calculated by the compilers.
(c) The solid phases are: A = NH4H2PO4; B = KNO3.
(a) The composition units are: mol/100 mol of solute.
(b) The molalities were calculated by the compilers. The unit is: mol kg-1.
(c) The solid phases are: A = ice; B = NH4H2PO4; C = KNO3.
