SDS Volume (2853)

Volume 66. Ammonium Phosphates, p None

Original Measurements

Buchanan, G. H.; Winner, G. B.; J. Ind. Eng. Chem. 1920, 12, 448.

Variables:

Composition and temperature.

Prepared by:

J. Eysseltová

Method/Apparatus/Procedure:

The samples were placed in two glass bottles of about 250 mL capacity. In one of them, the equilibrium was approached from below, in the other from above. Samples of the saturated solution were withdrawn by a special weighing pipet and analyzed. $\ce{NH3}$ was determined by the distillation method and $\ce{P2O5}$ was determined by precipitation as 'double magnesium salt' ($\ce{NH4MgPO4}$ - compiler). The temperature of the thermostatic bath was controlled by the introduction of steam or ice water. At higher temperatures an electric hot plate was used. For the highest temperatures, calcium chloride brine was used in the bath.

Source and Purity of Materials:

1. The salt was prepared by ammoniating a nearly saturated solution of mono-salt at a temperature above 80°C, cooling the mixture and filtering the crystals, and air drying them. Analyses experimental calculated $\ce{NH3}$ 14.80 14.80 $\ce{P2O5}$ 61.57   61.72 

Estimated Errors:

Ambient temperature: The temperature was kept constant to within 0.5 K.
Mass concentration (m/v) (1): The compiler estimates the reproducibility of the solubility values to be approximately 1%.