saleratus

Sodium or potassium bicarbonate used as a leavening agent; baking soda.

Originally potassium bicarbonate, but at present sodium bicarbonate is commonly sold under the same name.

Aërated salt; a white crystalline substance having an alkaline taste and reaction, consisting of sodium bicarbonate (see under sodium.) It is largely used in cooking, with sour milk (lactic acid) or cream of tartar as a substitute for yeast. It is also an ingredient of most baking powders, and is used in the preparation of effervescing drinks.

sodium bicarbonate

potassium bicarbonate

a white soluble compound (NaHCO3) used in effervescent drinks and in baking powders and as an antacid