SDS Volume

Volume 66. Ammonium Phosphates, p None

Source Publication

Farr, T. D.; Fleming, J. D.; Hatfield, J. D.; J. Chem. Eng. Data 1967, 12, 141.

Conditions:

Room Temp: Composition at 273 and 298.3 K. $\pu{K}$

Compiler:

J. Eysseltová

Methodology:

The complexes, in capped plastic bottles, were equilibrated isothermally in a cold room or in a water bath. The approach to equilibrium was followed by periodic petrographic and X-ray examination of the solid phases and by determination of composition and pH of the liquid phase. Phosphorus was determined gravimetrically as quinolinium molybdophosphate [1], and nitrogen was determined by distillation of ammonia with $\ce{NaOH}$.

Sample Information:

1. The ammonium tripolyphosphates and their solutions were prepared by ammoniation and vacuum evaporation of 0.3 N tripolyphosphoric acid that had been prepared by ion exchange from solutions of recrystallized $\ce{Na5P3O10}$. All operations were carried out at temperatures below 10 °C. Techniques similar to those used in preparing crystalline ammonium pyrophosphates [2] were used to prepare ammonium tripolyphosphates.

Measurement Errors:

Ambient temperature: The only information given is that the temperature control was as follows: 273 ±0.5 K and 298.30 ±0.05 K.

Methodology Citations

¹ Perrin, C. H.; J. Assoc. Offic. Agr. Chemists 41, 758 (1958).
² Farr, T. D.; Fleming, J. D.; J. Chem. Eng. Data 1965, 10. 20.