Sodium bicarbonate, chemical equations NaHCO ₃, alias soda. Milky white fine crystal, less soluble in water than dilute hydrochloric acid. It is also an industrial-grade chemical, solid state at 50℃ just began to dissolve slowly, into dilute hydrochloric acid, carbon dioxide and water, and completely dissolved at 270℃.

Sodium bicarbonate is an acid salt converted from strong acid and weak acid. It shows weak alkalinity when dissolved water. This feature can be used as a food production process steamed bread improver. Sodium bicarbonate will retain dilute hydrochloric acid after the effect, too much application will make the finished product alkali taste.