1, are all the same. Baking soda is sodium bicarbonate, also known as acid sodium carbonate, which is an acid salt with the chemical formula of NaHCO3. People usually only know that it can be used to make bread, soda and fire extinguishing agent, and it can treat mold infection in medicine.

2. Baking soda, namely SodiumBicarbonate, commonly known as "baking soda", "baking soda powder" and "Chongcao", is a white fine crystal, and its solubility in water is less than that of sodium carbonate.

3. Sodium bicarbonate is a kind of white alkaline powder which is easily soluble in water. After combining with water, it begins to act to release carbon dioxide CO2, which reacts faster in acidic liquids (such as fruit juice), and with the increase of ambient temperature, the effect of releasing gas is faster.

4. Sodium bicarbonate can be directly used as raw material in pharmaceutical industry to treat hyperacidity. It can also be used in film production, tanning, mineral processing, smelting, metal heat treatment, and fiber and rubber industries. At the same time, it is used as a detergent for wool and for agricultural seed soaking.