Soda lime, also known as sodium lime, white or beige powder, loose porous, is calcium oxide (CaO, about 75%), water (H2O, about 20%), sodium hydroxide (NaOH, about 3%), and hydroxide A mixture of potassium (KOH, about 1%), mainly used as a desiccant (where sodium hydroxide acts as a drying agent), can be used to dry neutral gases such as oxygen. It can also be used to absorb acid gases such as carbon dioxide and sulfur dioxide.
If only sodium hydroxide is present, the desiccant will not be used at higher temperatures because sodium hydroxide can react with the most commonly used glassware in the laboratory (containing a large amount of silica) to corrode the instrument. A small amount of methane from the laboratory can be co-heated with soda lime and sodium acetate (sodium acetate) to form sodium carbonate and methane.
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