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What (who) is caustic soda - definition
![drain cleaner]].](https://commons.wikimedia.org/wiki/Special:FilePath/NaOH - drain-cleaner.jpg?width=200 "drain cleaner]].")
![[[Chemical burn]]s caused by sodium hydroxide solution photographed 44 hours after exposure.](https://commons.wikimedia.org/wiki/Special:FilePath/Sodium hydroxide burn.png?width=200 "[[Chemical burn]]s caused by sodium hydroxide solution photographed 44 hours after exposure.")
Wikipedia
Sodium hydroxide, also known as lye and caustic soda, is an inorganic compound with the formula NaOH. It is a white solid ionic compound consisting of sodium cations Na+ and hydroxide anions OH−.
Sodium hydroxide is a highly corrosive base and alkali that decomposes proteins at ordinary ambient temperatures and may cause severe chemical burns. It is highly soluble in water, and readily absorbs moisture and carbon dioxide from the air. It forms a series of hydrates NaOH·nH2O. The monohydrate NaOH·H2O crystallizes from water solutions between 12.3 and 61.8 °C. The commercially available "sodium hydroxide" is often this monohydrate, and published data may refer to it instead of the anhydrous compound.
As one of the simplest hydroxides, sodium hydroxide is frequently used alongside neutral water and acidic hydrochloric acid to demonstrate the pH scale to chemistry students.
Sodium hydroxide is used in many industries: in the making of wood pulp and paper, textiles, drinking water, soaps and detergents, and as a drain cleaner. Worldwide production in 2004 was approximately 60 million tons, while demand was 51 million tons.
