Soda lime can dry neutral and alkaline gases. Because the calcium hydroxide or sodium hydroxide in soda lime has the ability to absorb water, it can absorb the water vapor in the gas. It can be used to dry neutral gases such as oxygen, and can also be used to dry alkaline gases such as ammonia. At the same time, it can also be used to absorb acidic gases, such as carbon dioxide and sulfur dioxide. Soda lime, also known as soda lime, is white or beige powder, loose and porous, and is a mixture of calcium hydroxide, water, sodium hydroxide, and potassium hydroxide.