Baking soda is an inorganic salt, white crystalline powder, odorless, alkaline taste, soluble in water. In humid air or hot air, it decomposes slowly and produces carbon dioxide, and it decomposes completely when heated to 270°C. When it meets acid, it decomposes strongly and produces carbon dioxide. When it meets acid, it decomposes strongly and produces carbon dioxide.

The scientific name of baking soda is sodium bicarbonate, and sodium bicarbonate solid at 50 ℃ above the beginning of the gradual decomposition of the generation of sodium carbonate, water and carbon dioxide gas, often used as a cookie, pastries, buns, bread, the characteristics of the puffing agent. Sodium bicarbonate in the role of the residual sodium carbonate, the use of too much will make the finished product has an alkali flavor.