Bicarbonate of Soda
Source: Modern American Drinks
1 bar-spoonful sodium carbonate
Ingredient: sodium carbonateAlso Known As: washing soda, soda crystals, soda ash What it is: Additive
Sodium salt of carbonic acid. It most commonly occurs as a crystalline heptahydrate, which readily effloresces to form a white powder, the monohydrate; and is domestically well known for its everyday use as a water softener. It has a cooling alkaline taste, and can be extracted from the ashes of many plants. It is synthetically produced in large quantities from table salt in a process known as the Solvay process.
One small bar-spoonful of bicarbonate of soda in a medium-sized glassful of plain water or seltzer (this is an excellent stomach-settler).