Compilation - Ammonium dihydrogenphosphate with Diammonium hydrogenphosphate, Potassium dihydrogenphosphate and Water (IUPAC SDS Volume 66)
SDS Volume (2938)
Volume 66. Ammonium Phosphates, p None
Original Measurements
Vogel, L.; Figurski, G.; Vohland, P.; Z. Chem. 1983, 23, 331.
Variables:
Composition and temperature.
Prepared by:
Method/Apparatus/Procedure:
The method and apparatus have been described previously [1]. However, plastic stoppers with glass caps were used instead of sealing the vessels.
Source and Purity of Materials:
- No information is given.
Estimated Errors:
Ambient temperature: The temperature was accurate to within ±0.05 K.
Mass concentration (m/v) (1): The precision of the weights was ±0.0001 g.
References
1 Schuberth, H.; Abhandlung der Deutschen Akademie der Wissenschaften zu Berlin, Klasse fur Chemie, Geologie u. Biologie, Jg. Nr. 3 , p. 40 (1960).
Components:
- Ammonium dihydrogenphosphate, $\ce{ NH4H2PO4 }$; [7722-76-1] NIST WebBook
- Diammonium hydrogenphosphate, $\ce{ (NH4)2HPO4 }$; [7783-28-0] NIST WebBook
- Potassium dihydrogenphosphate, $\ce{ KH2PO4 }$; [7778-77-0] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
The solubilities are presented in graphical form only. The data can be represented by the following equation: ln x = A + B/T + C lnT. Where x is the mol fraction of the salt in the saturated solution. The values of the constants are given below:
Salt component | Constants: A, B/K, C | Median error of smoothing (x)
| 1st coef. | 2nd coef. ($\pu{K-1}$) | 3rd coef. | Error |
|---|---|---|---|
| 36.422 | -3.370284 x 103 | -4.901 | 0.156 |
| -31.639 | 697.129 | 4.718 | 0.072 |
| -4.810 | -1.510549 x 103 | 1.128 | 0.094 |
(a) Median error of smoothing (x).
