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Sodium hydroxide (NaOH), also known as lye and caustic soda, is an inorganic compound. It is a white solid and highly caustic metallic base and alkali salt of sodium which is available in pellets, flakes, granules, and as prepared solutions at a number of different concentrations. Sodium hydroxide forms an approximately 50% (by weight) saturated solution with water.; Sodium hydroxide is soluble in water, ethanol, and methanol. This alkali is deliquescent and readily absorbs moisture and carbon dioxide in air.
Sodium hydroxide is used in many industries, mostly as a strong chemical base in the manufacture of pulp and paper, textiles, drinking water, soaps and detergents and as a drain cleaner. Worldwide production in 2004 was approximately 60million tonnes, while demand was 51million tonnes.
| Chemical Name | sodium hydroxide |
| Synonyms | NaOH;caustic soda;Sodium hydroxide; |
| CAS No. | 1310-73-2 |
| Molecular Formula | HNaO |
| Molecular Weight | 39.99710 |
| PSA | 23.06000 |
| LogP | -0.17680 |
| Appearance & Physical State | odourless white waxy, opaque crystals (often sold as pellets) |
| Density | 2.13 g/cm3 |
| Boiling Point | 1388ºC |
| Melting Point | 318ºC |
| Flash Point | N/A |
| Refractive Index | 1.473-1.475 |
| Water Solubility | 418 g/L (0 °C), 1110 g/L (20 °C), 3370 g/L (100 °C) |
| Soluble | soluble in methanol and glycerol, negligible in ammonia, insoluble in ether |
| Storage Condition | 2-8ºC |
| Vapor Density | <1 (vs air) |
| Vapor Pressure | 1 mm Hg ( 745 °C) |
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