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Sodium hydroxide, also known as lye and caustic soda, is an inorganic compound with the formula NaOH. It is a highly corrosive strong alkali, usually in the form of white flakes or particles, which can dissolve in water to form an alkaline solution, and can also dissolve in methanol and ethanol. This alkaline substance can absorb water vapor from the air, as well as acidic gases such as carbon dioxide and sulfur dioxide.