Skip to content
Vinony
English
EnglishBahasa IndonesiaDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsSvenskaTiếng ViệtTürkçeРусскийالعربيةفارسیहिन्दीไทย한국어中文日本語
sodium hydroxide

File:Sodium-hydroxide-crystal-3D-vdW.png · Wikimedia Commons · See Wikimedia Commons

EntityQ102769· pop 86· linked from 1,534 articles

sodium hydroxide

Sign in to save

Also known as caustic soda, lye, soda lye, sodium hydrate, white caustic

chemical compound

OverviewAI-generated

Sodium hydroxide is a chemical compound with the formula NaOH, also written as HNaO. It has a molar mass of 39.993 and a standard enthalpy of formation of -425.6. The substance has a density of 2.13, a melting point of 605, and a boiling point of 2534. Its solubility is 111, while its vapor pressure is 0. The canonical SMILES representation is [OH-].[Na+].

Safety data indicates a ceiling exposure limit of 2 and a time-weighted average exposure limit of 2. The immediately dangerous to life or health level is 10. In terms of molecular properties, sodium hydroxide has a topological polar surface area of 1, with one hydrogen bond donor and one hydrogen bond acceptor. The overall charge is 0.

Synthesized by Vinony from 26 facts across 4 sources: Wikidata, PubChem, PubMed, Vinony graph. Generated from structured data (not the Wikipedia text) and checked against those facts — may still contain errors.

Chemical data

Formula
HNaO
Molecular weight
39.997 g/mol
IUPAC name
sodium hydroxide
SMILES
[OH-].[Na+]
InChIKey
HEMHJVSKTPXQMS-UHFFFAOYSA-M
Polar surface area
1 Ų
H-bond donors
1
H-bond acceptors
1
Formal charge
0

via PubChem

Research

13,585 papers

via PubMed

~31 min read

Encyclopedic overview

Sodium hydroxide, also known as caustic soda and, more generically, as lye, is an inorganic compound with the formula NaOH. It is a white solid ionic compound consisting of sodium cations Na and hydroxide anions OH.

Sodium hydroxide is a highly corrosive base and alkali that decomposes lipids and proteins at ambient temperatures, and may cause severe chemical burns at high concentrations. It is highly soluble in water, and readily absorbs moisture and carbon dioxide from the air. It forms a series of hydrates NaOH·nH2O. The monohydrate NaOH·H2O crystallizes from water solutions between 12.3 and 61.8 °C. The commercially available "sodium hydroxide" is often this monohydrate, and published data may refer to it instead of the anhydrous compound.

Excerpted from Wikipedia’s “sodium hydroxide” article, available under the CC BY-SA 4.0 licence.

Gallery (10)

Available in 84 languages

Show 65 more

via Wikidata sitelinks · CC0