Acidum Phosphoricum. Phosphoric Acid. A liquid composed of not less than 85 per cent., by weight, of absolute Orthophos-phoric Acid (H3Po4=97.8), in water.

Source

When Phosphorus is brought into contact with Nitric Acid, it is slowly oxidized and converted into Phosphoric Acid. P3+5Hno3+2H2O =3H3PO+5NO.

Characters

A colorless liquid, without odor, but having a strongly acid taste. Sp. gr., 1.347.

Impurities

Calcium preparations, and sodium carbonate.

Phosphoric Acid is contained in Syrupus Quininae et Strychninae Phos-phatum.

Preparation

Acidum Phosphoricum Dilutum

Diluted Phosphoric Acid. Phosphoric Acid, 100; distilled water, 750. Sp. gr., about 1.057. It contains 10 per cent., by weight, of absolute Orthophosphoric Acid.

Dose, 5 to 30 m.; .30 to 2.00 c.c.