Sodium bicarbonate, chemical formula: NaHCO₃, commonly known as baking soda, white fine crystals, white alkaline powder easily soluble in water, no change in dry air, slowly decomposed in humid air to release carbon dioxide. It can also be used in film production, tanning, mineral processing, smelting, metal heat treatment, and in fiber and rubber industries. At the same time, it is used as a detergent for wool, as well as for agricultural seed soaking.