SDS Volume (2894)
Volume 66. Ammonium Phosphates, p None
Original Measurements
Solov'ev, A. P.; Balashova, E. F.; Verendykina, N. A.; Zyuzina, L. F.; Vzaimodeistvie Khloridov Kaliya, Magniya, Ammoniya s ikh Nitratami i Fosfatami 1977, 3.
Variables:
Room Temp: Composition at 25 °C
Prepared by:
Method/Apparatus/Procedure:
The method of invariant points was used. A third component was added to eutectic systems until a new solid phase appeared. At equilibrium both liquid and solid phases were analyzed. Chloride ion content was determined by the Volhard method. $\ce{H2PO4^{-}}$ ions were precipitated as $\ce{NH4MgPO4.6H2O}$, and the excess of $\ce{Mg}$ was titrated complexometrically [1]. Ammonium ions were removed and the excess of base was titrated with $\ce{HCl}$.
Source and Purity of Materials:
- No information is given.
Estimated Errors:
Ambient temperature: No information is given.
Mass concentration (m/v) (1): No information is given.
References
1 Shemyakin, F. M.; Zelenina, E. N.; Zavod. Lab. 6 (1969).
Components:
- Ammonium dihydrogenphosphate, $\ce{ NH4H2PO4 }$; [7722-76-1] NIST WebBook
- Ammonium chloride, $\ce{ NH4Cl }$; [12125-02-9] NIST WebBook
- Sodium dihydrogenphosphate, $\ce{ NaH2PO4 }$; [7558-80-7] NIST WebBook
- Sodium chloride, $\ce{ NaCl }$; [7647-14-5] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
Solubility in the Na+, NH4+||Cl-, H2PO4--H2O system at 25°C.
| 100w1 | 100w2 | 100w3 | m1 (mol/kg) | m2 (mol/kg) | m3 (mol/kg) | Phase (s) () |
|---|---|---|---|---|---|---|
| 25.01 | 15.13 | 3.48 | 4.33 | A + B | ||
| 24.74 | 13.97 | 4.55 | 3.63 | 4.21 | 0.70 | A + B |
| 23.26 | 12.90 | 8.59 | 3.51 | 4.00 | 1.35 | A + B |
| 24.19 | 11.01 | 12.40 | 3.85 | 3.60 | 2.06 | A + B + C |
| 43.47 | 11.93 | 8.12 | 2.35 | B + C | ||
| 38.32 | 4.54 | 13.11 | 7.25 | 1.76 | 2.59 | B + C |
| 32.90 | 8.00 | 12.79 | 5.20 | 2.96 | 2.40 | B + C |
| 30.54 | 9.33 | 12.78 | 5.37 | 3.37 | 2.35 | B + C |
| 12.30 | 16.87 | 12.58 | 1.78 | 4.96 | 1.88 | A + C |
| 20.85 | 17.10 | 5.75 | 2.40 | A + C | ||
| 16.07 | 5.64 | 12.93 | 4.21 | 0.75 | 3.70 | A + C + D |
| 17.07 | 2.82 | 13.88 | 4.41 | 0.37 | 3.92 | A + D |
| 17.15 | 16.14 | 4.40 | 4.52 | A + D | ||
| 8.68 | 4.48 | 18.75 | 2.18 | 0.57 | 5.15 | C + D |
| 5.89 | 5.15 | 21.11 | 1.48 | 0.66 | 5.82 | C + D |
| 1.59 | 5.60 | 22.91 | 0.39 | 0.70 | 6.13 | C + D |
| 6.12 | 25.54 | 0.78 | 6.98 | C + D |
(a) These values were calculated by the compiler.
(b) The solid phases are: A = NCl; B = NaH2PO4·2H2O; C = NH4H2PO4; D = NH4Cl.
(c) In the original article these values were designated as ion %. The compiler believes that the units here are: mol/100 mol of solute.
