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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.

1. customA milky white suspension formed
2. stirringwas stirred for four hours
3. filtrationA solid was recovered upon filtration through a Buchner funnel
4. washwashed with 1200 ml of distilled water
5. filtrationfiltered to dryness
6. customwas placed in a vacuum oven at 120° C.
7. wait20mm of mercury for several hours to effect more complete