SDS Volume

Volume 66. Ammonium Phosphates, p None

Source Publication

Brosheer, J. C.; Anderson Jr., J. F.; J. Am. Chem. Soc. 1946, 68, 902.

Conditions:

Room Temp: Composition at 60 and 75 °C

Compiler:

J. Eysseltová

Methodology:

Mixtures were placed in 300 mL glass-stoppered bottles which were rotated end-over-end in a constant temperature bath for at least three days. Mixtures in which the vapor pressure of $\ce{NH3}$ prevented accurate sampling from open flasks were placed in special flasks for use under pressure. Aliquots of $\ce{HCl}$ solutions of the samples were analyzed for $\ce{NH3}$ by addition of alkali and distillation into standard acid. Other aliquots were analyzed for $\ce{H3PO4}$ by double precipitation as $\ce{NH4MgPO4.6H2O}$ and ignition to $\ce{Mg2P2O7}$.

Sample Information:

1. Reagent grade $\ce{H3PO4}$, monoammonium phosphate, diammonium phosphate and aqueous ammonia were used. Recrystallization did not alter the solubility of the salts.

Measurement Errors:

Ambient temperature: The temperature was kept constant to within ±0.05 K. Duplicate results were accepted only when they agreed within 0.5%.