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**Molecular formula:** NaOH
**Molar mass:** 39,997 g/mol
**Information:** Sodium hydroxide (lye and caustic soda) is a strong alkaline, water-soluble, white crystalline substance. It is an ionic compound containing a sodium cation of Na⁺ and a hydroxide anion OH⁻.
**Use:** It has significant use in the chemical industry where it is used as a base and as a precursor for the production of other sodium compounds. It is also used for making soaps. At home is used as a pipe cleaner.