Caustic soda is an inorganic compound that is a metallic base neutralized by acidic substances. The chemical name for caustic soda is sodium hydroxide, and it has the chemical formula NaOH. It is also known as lye.
When caustic soda is exposed to a protic acid, it produces water and a corresponding salt. Caustic soda is soluble in water and glycerol. It is not soluble in ether. Caustic soda is used in the soap-making process, as well as in the chemical pulping of wood and food preparation. It is also sometimes used as an industrial cleaning agent. Caustic soda can cause severe burns if it comes into contact with body tissue.