Flour screwdriver refers to old dough, which is used for fermentation when steaming steamed bread, also called starter. Baking soda is an inorganic compound used as a carbon dioxide generator in food, soft drinks and cold drinks.

Related information: Baking soda is sodium bicarbonate, white crystalline powder, odorless, alkaline and soluble in water. Slowly decompose in humid air or hot air to produce carbon dioxide, which is completely decomposed when heated to 270 degrees Celsius. Strong decomposition in acid produces carbon dioxide. Sodium bicarbonate is widely used in analytical chemistry, inorganic synthesis, industrial production, agriculture and animal husbandry. Sodium bicarbonate is not dangerous, but it should be moisture-proof. Store in a dry and ventilated warehouse. Do not mix with acid for storage and transportation. When eating baking soda, you should pay special attention not to mix with toxic substances to prevent pollution.