Sodium hydroxide

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Sodium hydroxide
CAS number 1310-73-2 YesY
PubChem 14798
ChemSpider 14114 YesY
UNII 55X04QC32I YesY
EC nummer 215-185-5
UN nummer 1823
KEGG D01169 YesY
MeSH Sodium+Hydroxide
ChEBI CHEBI:32145 YesY
RTECS nummer WB4900000
Gmelin Reference 68430
Jmol-3D images Image 1
Molecular formula NaOH
Molar mass 39.9971 g mol−1
Appearance White, waxy, opaque crystals
Odor odorless
Density 2.13 g/cm3
Meltin pynt

318 °C, 591 K, 604 °F

Boilin pynt

1388 °C, 1661 K, 2530 °F

Solubility in water 111 g/100 mL (at 20 °C)
Solubility in methanol 23.8 g/100 mL
Solubility in ethanol <<13.9 g/100 mL
Vapor pressure <2.4 kPa (at 20 °C)
Acidity (pKa) 13
Refractive index (nD) 1.3576
MSDS External MSDS
GHS pictograms The corrosion pictogram in the Globally Harmonized Seestem o Classification an Labelling o Chemicals (GHS)
EU Index 011-002-00-6
EU classification Corrosive C
R-phrases R35
S-phrases (S1/2), S26, S37/39, S45
NFPA 704
NFPA 704.svg
Related compounds
Ither anions Sodium hydrosulfide
Ither cations Caesium hydroxide

Lithium hydroxide
Potassium hydroxide
Rubidium hydroxide

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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Sodium hydroxide, an aa kent as caustic soda,[2][3] or lye, is an inorganic compoond wi the chemical formula NaOH (an aa written as NaHO). It is a white solid, an is a heichly caustic metallic base an alkali saut. It is available in pellets, flakes, granules, an as prepared solutions at a nummer o different concentrations.[4] Sodium hydroxide furms an approximately 50% (bi weight) saturatit solution wi watter.[5]

Sodium hydroxide is soluble in watter, ethanol an methanol. This alkali is deliquescent an readily absorbs moistur an carbon dioxide in air.

Sodium hydroxide is uised in mony industries, maistly as a strang chemical base in the manufacture o pulp an paper, textiles, drinkin watter, soaps an detergents an as a drain cleaner. Warldwide production in 2004 wis approximately 60 million tonnes, while demand was 51 million tonnes.[6]

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