反应详情

Barium phosphate was prepared by the following procedure. Barium hydroxide monohydrate (15.0 g, 79.2 mmoles) was dissolved in 1500 ml of distilled water under stirring for one hour. Phosphoric acid (6.1 grams of 85%w phosphoric acid, containing 52.8 mmoles of the acid) was diluted with 100 ml of distilled water and the dilute acid solution was then added dropwise to the barium hydroxide solution over an eight minute period. A milky white suspension formed and remained. The suspension was stirred for two hours and then filtered through a Buchner funnel, washed with 600 ml of distilled water, and filtered to dryness. The precipitate was placed in a vacuum oven at 120° C. at a pressure of 20 mm 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. stirringThe suspension was stirred for two hours
3. filtrationfiltered through a Buchner funnel
4. washwashed with 600 ml of distilled water
5. filtrationfiltered to dryness
6. waitThe precipitate was placed in a vacuum oven at 120° C. at a pressure of 20 mm mercury for several hours