Sodium hydroxide

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Sodium hydroxide
Unit cell, spacefill model of sodium hydroxide
Sample of sodium hydroxide as pellets in a watchglass
Preferred IUPAC name
Sodium hydroxide[3]
Seestematic IUPAC name
Sodium oxidanide
Ither names
Caustic soda

Lye [1][2]
White caustic

Sodium hydrate[3]
1310-73-2 YesY
ChEBI CHEBI:32145 YesY
ChemSpider 14114 YesY
EC-nummer [1]
Gmelin Reference 68430
Jmol-3D images Image
KEGG D01169 YesY
MeSH Sodium+Hydroxide
RTECS nummer WB4900000
UNII 55X04QC32I YesY
UN nummer 1823
Molar mass 39.9971 g mol−1
Appearance White, waxy, opaque crystals
Odor odorless
Density 2.13 g/cm3
Meltin pynt 318 °C (604 °F; 591 K)
Boilin pynt 1,388 °C (2,530 °F; 1,661 K)
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
Safety data sheet External MSDS
GHS pictograms The corrosion pictogram in the Globally Harmonized Seestem o Classification an Labelling o Chemicals (GHS)
EU classification {{{value}}}
R-phrases R35
S-phrases (S1/2), S26, S37/39, S45
NFPA 704
Flammability code 0: Will nae burn. E.g., watter Health code 3: Short exposur could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 1: Normally stable, but can acome unstable at elevatit temperaturs an pressurs. E.g., calcium Special hazard ALK: Alkaline.NFPA 704 four-colored diamond
Related compounds
Ither anions Sodium hydrosulfide
Ither cations Caesium hydroxide

Lithium hydroxide
Potassium hydroxide
Rubidium hydroxide

Except whaur otherwise notit, data are gien for materials in thair staundart state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Sodium hydroxide, an aa kent as caustic soda,[1][2] 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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