Sodium bicarbonate is divided into two types, edible type and industrial type. Edible sodium bicarbonate is edible, but industrial sodium bicarbonate is not.

1. Edible sodium bicarbonate, also known as baking soda, is the most widely used loosening agent in the food industry. It is used in the production of pastries, steamed buns, bread, etc. and is edible.

2. Industrial sodium bicarbonate can be directly used as a raw material in the pharmaceutical industry to treat hyperacidity. It can also be used in film production, tanning, mineral processing, smelting, metal heat treatment, as well as in fiber and rubber industries. It is also used as a detergent for wool and for soaking seeds in agriculture. It is not edible.