What is Sodium Hydroxide?
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Caustic soda is the commercial/common name for the inorganic compound sodium hydroxide (CAS Number: 1310-73-2). Its chemical formula is NaOH. Sodium hydroxide consists of sodium cations Na+ and hydroxide anions OH−.
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It is a white solid in its pure form and is commercially sold in the form of pellets, flakes with 50% liquid solution in water.
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Lye is the second most common name for sodium hydroxide.
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Pure caustic soda is sold to produce soap or candles.