The form in which sodium carbonate is now official.

Properties : Monohydrated sodium carbonate should contain not less than 85 per cent, of anhydrous sodium carbonate (Na2C03). It occurs as a white, crystalline, granular powder, odorless and having a strongly alkaline taste. It is freely soluble in water (1:2.9) and practically insoluble in alcohol. Sodium carbonate, as now official, contains but one molecule of water of crystallization, and is nearly twice as strong in alkaline power as the ordinary crystalline carbonate, Na2CO3l2H2O, commonly known as "sal soda."

Incompatibilities : Sodium carbonate is incompatible with acids and acid salts and with the salts of the heavy metals and of alkaloids.

Action and Uses: Sodium carbonate is an antacid and is employed in medicine chiefly in the preparation of alkaline baths. For this purpose it may be used in the proportion of from 2 to 6 ounces for 30 gallons of water.

Dosage: 0.25 gm. or 4 grains.