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Cautic Soda
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Product : Cautic Soda
High Quality
Earliest shipment
COmpetitive price
Professional service


Sodium hydroxide (NaOH), also known as lye and caustic soda, is a caustic metallic base. It 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 60 million tonnes, while demand was 51 million tonnes.[1]

Pure sodium hydroxide is a white solid available in pellets, flakes, granules, and as a 50% saturated solution. It is hygroscopic and readily absorbs carbon dioxide from the air, so it should be stored in an airtight container. It is very soluble in water with liberation of heat. It also dissolves in ethanol and methanol, though it exhibits lower solubility in these solvents than does potassium hydroxide. Molten sodium hydroxide is also a strong base, but the high temperature required limits applications. It is insoluble in ether and other non-polar solvents. A sodium hydroxide solution will leave a yellow stain on fabric and paper.



Sodium hydroxideIdentifiersPropertiesHazardsRelated compounds
IUPAC name[hide]Sodium hydroxide
Systematic name[hide]Sodium oxidanide
Other names[hide]Caustic soda
CAS number1310-73-2 Y
ChemSpider14114 Y
EC number215-185-5
UN number1823
KEGGC12569 Y
RTECS numberWB4900000
Gmelin Reference68430
Jmol-3D imagesImage 1
Image 2
[show][OH-].[Na+] [Na+].[OH-]
[show]InChI=1S/Na.H2O/h;1H2/q+1;/p-1 Y
Molecular formulaNaOH
Molar mass39.997 g/mol
Exact mass39.992509329 g mol−1
AppearanceWhite opaque crystals
Density2.13 g cm−3
Melting point

318 °C, 591 K, 604 °F

Boiling point

1388 °C, 1661 K, 2530 °F

Solubility in water1110 g/L (at 20 °C)
Solubility in methanol238 g/L
Solubility in ethanol<<139 g/L
Vapor pressure<18 mmHg (at 20 °C)
Acidity (pKa)13
Refractive index (nD)1.412
EU Index011-002-00-6
EU classificationC
S-phrases(S1/2), S26, S37/39, S45
NFPA 704031COR
Other anionsSodium hydrosulfide
Other cationsCaesium hydroxide

Lithium hydroxide
Potassium hydroxide
Rubidium hydroxide

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