Baking soda is a leavening agent used in baked goods like cakes, muffins, and cookies.It is Sodium bicarbonate which is a salt composed of a sodium cation and a bicarbonate anion. It is white fine powder that is crystalline. In addition it can be used as Hand, face and body scrub also for oral hygiene and throat gargle. Antacid digestive to eliminate stomach acid. Remember it can be used absorb bad odors.