Phosphoric Acid → Phosphoric acid, barium salt (2:3)

Participants

Reaction Steps

Barium phosphate was prepared by the following procedure. Barium hydroxide monohydrate (20.0 g, 105.6 mmoles) was dissolved in 3000 ml of distilled water with stirring for a few minutes. Phosphoric acid (8.1 g of 85%w phosphoric acid, containing 70.4 mmoles of the acid) was diluted with 100 ml of distilled water and the dilute acid was added dropwise to the barium hydroxide solution over a ten minute period. A milky white suspension formed and remained as the mixture was stirred for four hours. A solid was recovered upon filtration through a Buchner funnel, washed with 1200 ml of distilled water, and filtered to dryness. The solid was placed in a vacuum oven at 120° C. and 20mm of mercury for several hours to effect more complete dryness. The white solid was analyzed by X-ray powder diffraction and found to contain Ba3 (PO4)2 as the only crystalline product.

Provenance & Evidence