SDS Volume (2850)
Volume 66. Ammonium Phosphates, p None
Original Measurements
Sarbaev, A. N.; Polyakov, E. V.; Tyunina, M. F.; Polyakova, Z. A.; Ruchkova, A. Kh.; Khim. Prom. (Moscow) 1972, 48, 597-561.
Variables:
Composition, temperature and boiling points at pressures of 20 mm - 760 mm Hg of samples containing a N:P:K ratio equal - 1:1:1.
Prepared by:
Method/Apparatus/Procedure:
A visual polythermic method was used at temperatures below 50 °C. Supersaturation was prevented by seeding. Above 50 °C a synthetic method was used [1-3]. The samples were placed in glass ampules and placed in an air thermostat where they were rotated at 3 rpm. They were observed through a glass window in the thermostat. A self-constructed apparatus based on the principle described elsewhere [4] was used.
Source and Purity of Materials:
- Reagent grade $\ce{NH4H2PO4}$ (GOST 6691-67) and urea (GOST 3771-64) and chemically pure KCl (GOST 4234-69) were used.
Estimated Errors:
Ambient temperature: With the visual-polythermic method the difference between the temperature of dissolution of the last crystal and appearance of the first crystal was less than + 0.5 K. Above 50°C the temperature had a precision of 0.4 K. No other information is given.
Mass concentration (m/v) (1): No information is given.
References
1
Alekseev, V. F.; Zh. Russ. Fiz. -Khim. Obshch. 1876, 8, 329.
2
Lebedeva, E. S.; Khodeeva, S. M. Zh. Fiz. Khim. 1961, 35, 2602.
3
Krichevskiy, I. R.; Khazanova, N. E.; Liushic, L. R.; Zh. Fiz. Khim. 1957, 31, 2711.
4
Goroletskiy, Ya; Olevskiy, V. M.; Levitanayte, R. P.; Zh. Fiz. Khim. 1964, 38, 2874.
Components:
- Ammonium dihydrogenphosphate, $\ce{ NH4H2PO4 }$; [7722-76-1] NIST WebBook
- Urea, $\ce{ CH4N2O }$; [57-13-6] NIST WebBook
- Potassium chloride, $\ce{ KCl }$; [7447-40-7] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
Part 2. Composition and boiling points of saturated solutions in the NH4H2PO4-CO(NH2)2-KCl-H2O system at the ratio N:P:K = 1:1:1.
| $P_{1}$ (mm Hg) | 100w1 | 100w2 | 100w3 | 100w4 | 100w5 | BP (°C) | m2 (mol/kg) | m3 (mol/kg) | m4 (mol/kg) |
|---|---|---|---|---|---|---|---|---|---|
| 20 | 31.9 | 5.52 | 17.4 | 8.95 | 68.1 | 26.7 | 1.35 | 2.23 | 1.76 |
| 50 | 36.6 | 6.33 | 20.0 | 10.3 | 63.4 | 41.8 | 1.66 | 2.74 | 2.17 |
| 100 | 41.2 | 7.13 | 22.5 | 11.6 | 58.8 | 56.9 | 2.02 | 3.33 | 2.64 |
| 150 | 44.2 | 7.65 | 24.2 | 12.4 | 55.8 | 65.7 | 2.28 | 3.76 | 2.98 |
| 200 | 47.0 | 8.13 | 25.7 | 13.2 | 53.0 | 73.0 | 2.55 | 4.21 | 3.34 |
| 250 | 49.0 | 8.48 | 26.8 | 13.7 | 51.0 | 78.7 | 2.77 | 4.56 | 3.62 |
| 300 | 50.9 | 8.81 | 27.8 | 14.3 | 49.1 | 83.6 | 2.99 | 4.92 | 3.90 |
| 350 | 52.6 | 9.10 | 28.7 | 14.8 | 47.4 | 87.9 | 3.20 | 5.27 | 4.18 |
| 400 | 54.2 | 9.38 | 29.6 | 15.2 | 45.8 | 91.8 | 3.41 | 5.62 | 4.45 |
| 450 | 55.7 | 9.64 | 30.4 | 15.6 | 44.3 | 95.4 | 3.62 | 5.97 | 4.73 |
| 500 | 56.9 | 9.84 | 31.1 | 16.0 | 43.1 | 98.5 | 3.80 | 6.27 | 4.97 |
| 550 | 57.9 | 10.0 | 31.6 | 16.2 | 42.1 | 100.9 | 3.96 | 6.53 | 5.18 |
| 600 | 59.1 | 10.2 | 32.3 | 16.6 | 40.9 | 103.6 | 4.16 | 6.86 | 5.44 |
| 650 | 60.0 | 10.4 | 32.8 | 16.8 | 40.0 | 105.7 | 4.32 | 7.12 | 5.65 |
| 700 | 61.0 | 10.6 | 33.3 | 17.1 | 39.0 | 108.0 | 4.50 | 7.43 | 5.89 |
| 760 | 62.2 | 10.8 | 34.0 | 17.5 | 37.8 | 110.6 | 4.74 | 7.82 | 6.19 |
(a) These values were calculated by the compiler. The molalities are expressed as mol/kg H2O.
(a) These values were calculated by the compiler. The molalities are expressed as mol/kg H2O.
