Baking soda is the main ingredient in baking powder; Baking soda itself is a single substance and its chemical name is sodium bicarbonate. In addition to baking soda, several ingredients are added to the baking powder to make steamed bread and other foods with better effect.

Baking soda (alkali), tartar (acid) and corn starch (filler) are three commonly used ingredients in baking powder. Note: Baking soda and soda are different substances! Sodium carbonate, common name soda, soda ash, washing alkali, chemical formula: Na2CO3, usually white powder, is a strong electrolyte. The density is 2.532g/cm3, and the melting point is 851C. It is soluble in water and has the universality of salt.