The chemical formula for the main ingredients of soda lime: calcium oxide (CaO, about 75%), sodium hydroxide (NaOH, about 3%), and potassium hydroxide (KOH, about 1%), water (H2O. about 20%).

Soda lime is a mixture and has no single chemical formula. It is often expressed as NaON + CaO. Also known as soda lime, slaked lime is a white or beige powder, loose and porous, a mixture of calcium oxide (CaO, about 75%), water (H?O, about 20%), sodium hydroxide (NaOH, about 3%), and potassium hydroxide (KOH, about 1%).

Industrial soda-lime is obtained by calcining soda-lime (i.e., Na2CO3-NaHCO3-2H2O, potassium- and sodium-rich limestone) to obtain a Na2O-CaO or K2O-CaO product, and the clarified aqueous solution is concentrated to make caustic soda.

Soda lime plays different roles in different chemical reactions:

Carbonate decomposition by heating can produce CO2, only (NH4)2CO3 or NH4HCO3, the decomposition of the mixed gas produced by its passage through the soda lime, CO2 and H2O is absorbed, you can get a pure NH3.(Playing a drying role).

Using its drying effect can realize gas decontamination, such as NH?(H?O). Soda lime can also remove SO?, H?S, HCl, CO? and other acid gases. Commonly used desiccants in middle school are acidic \ alkaline \ neutral.

Desiccant, as the name suggests, is used to dry with (middle school is common to dry the gas of course, but also dry the liquid, middle school is not common), of course, according to the nature of the desiccant drying of different types of substances are also different.