SDS Volume
Volume 66. Ammonium Phosphates, p None
Source Publication
Babenko, A. M.; Andrianov, A. M.; Zh. Prikl. Khim. 57, 1921-5 (1984).
Conditions:
NH4NO3 and K2SO4 in a mixture containing a mole ratio of NH4H2PO4/(NH4)2HPO4 = 1.
Compiler:
Methodology:
An improved polythermic method [1] was used.
Sample Information:
- Chemically pure or reagent grade salts were recrystallized twice and dried at 40°C to 50°C. The material designated "mixture" was prepared by mixing equimolar amounts of $\ce{NH4H2PO4}$ and $\ce{(NH4)2HPO4}$ and homogenizing by grinding in a mortar.
Measurement Errors:
Ambient temperature: Precision of temperature measurement was ±0.4 K.
Methodology Citation
1 Erayzer, L. N.; Kaganskiy, I. M.; Zavod. Lab. 1967, 1, 119.
System Components:
- Ammonium dihydrogenphosphate, $\ce{ NH4H2PO4 }$; [7722-76-1] NIST WebBook
- Diammonium hydrogenphosphate, $\ce{ (NH4)2HPO4 }$; [7783-28-0] NIST WebBook
- Ammonium nitrate, $\ce{ NH4NO3 }$; [6484-52-2] NIST WebBook
- Potassium sulfate, $\ce{ K2SO4 }$; [7778-80-5] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
| $T$ (°C) | 100w1 | 100w2 | 100w3 | 100w4 | 100w5 | 100w6 | m1 (mol/kg) | m4 (mol/kg) | m5 (mol/kg) | Phase (s) () |
|---|---|---|---|---|---|---|---|---|---|---|
| -7.5 | 8.5b | 4.0b | 4.5b | 9.9b | 8.0b | 73.6b | 0.5 | 1.7 | 0.6 | A + B |
| -11.0 | 13.2 | 6.1 | 7.1 | 15.2 | 5.0 | 66.6 | 0.8 | 2.9 | 0.4 | A + B |
| -6.0 | 17.7 | 8.2 | 9.5 | 20.3 | 5.0 | 57.0 | 1.3 | 4.4 | 0.5 | B + C |
| 14.0 | 19.2 | 8.9 | 10.3 | 22.1 | 8.0 | 50.7 | 1.5 | 5.4 | 0.9 | B + C |
| 26.5 | 20.7 | 9.6 | 11.1 | 23.8 | 11.0 | 44.5 | 1.9 | 6.7 | 1.4 | B + C |
| -11.8 | 16.7 | 7.8 | 8.9 | 19.3 | 0.0 | 64.0 | 1.1 | 3.8 | 0.0 | A + B + C |
| 9.0 | 8.0 | 3.7 | 4.3 | 9.3 | 13.0 | 69.7 | 0.5 | 1.7 | 1.1 | B + D |
| 14.5 | 12.2 | 5.7 | 6.5 | 14.0 | 12.6 | 61.2 | 0.8 | 2.9 | 1.2 | B + D |
| 20.0 | 16.3 | 7.6 | 8.7 | 18.7 | 12.5 | 52.5 | 1.3 | 4.4 | 1.4 | B + D |
| 25.0 | 18.4 | 8.6 | 9.8 | 21.2 | 12.5 | 47.9 | 1.6 | 5.5 | 1.5 | B + D |
| 29.0 | 20.4 | 9.5 | 10.9 | 23.6 | 12.0 | 44.0 | 1.9 | 6.7 | 1.6 | B + C + D |
| -1.6 | 0.0 | 0.0 | 0.0 | 0.0 | 6.5 | 93.5 | 0.0 | 0.0 | 0.4 | A + D |
(a) "Mixture" is an equimolar mixture of NH4H2PO4 and (NH4)2HPO4.
(a) S is the total plant nutrient: (N+P
(b) W=100wi, M=mi/mol kg-1. Mass fractions of the ammonium phosphates and all molalities were calculated by the compiler.
(b) "Mixture" is an equimolar mixture of NH4H2PO4 and (NH4)2HPO4.
(c) The solid phases are: A = ice; B = NH4NO3; C = NH4H2PO4; D = K2SO4.
(c) W=100wi, M=mi/mol kg-1. Mass fractions of the ammonium phosphates and all molalities were calculated by the compiler.
