Deuterium oxide

Description

Deuterium oxide · CAS 7789-20-0 · H2O. UNII J65BV539M3. Boiling Point: 101.42 °C; Melting Point: 3.81 °C; triple point 3.82 °C; Vapor Pressure: VP: 1.999 kPa at 20 °C.

Identification

CAS Registry Number	7789-20-0
PubChem CID	24602
Molecular formula	H2O
IUPAC name	deuterated water
UNII (FDA)	J65BV539M3

Computed Descriptors

Molecular Weight	20.028
XLogP3	-0.5
Hydrogen Bond Donor Count	1
Hydrogen Bond Acceptor Count	1
Rotatable Bond Count	0
Exact Mass	20.023118175
Monoisotopic Mass	20.023118175
Topological Polar Surface Area	1
Heavy Atom Count	1
Formal Charge	0

Physical & Chemical Properties

Boiling Point	101.42 °C
Melting Point	3.81 °C; triple point 3.82 °C
Vapor Pressure	VP: 1.999 kPa at 20 °C
Vapor Pressure	20.6 mm Hg at 25 °C
Viscosity	1.107 cP at 25 °C
Surface Tension	71.93 dyn/cm at 25 °C

Physical description & handling notes

• Liquid
• Clear liquid; [Sax]
• Colorless liquid
• Odorless
• 1.1044 at 25 °C. Temp of max density 11.23 °C; 1.1059 at 11.23 °C
• Stable under recommended storage conditions.

Regulatory Status

GHS notification summary	99.6% (226 / 227)

GHS Hazard Classification

GHS notification summary	99.6% (226 / 227)

Documented Uses

• Used to study mechanisms and rates of chemical or nuclear reactions, as well as biological processes. [ChemIDplus] Deuterium oxide is present in nature. Water contains about 1 part per 6500. [Hawley]
• To study chemical reaction rates and mechanisms. The cross section of deuterium for the capture of thermal neutrons is very low which makes it useful, in the form of heavy water, as a neutron moderator in nuclear reactors. Produces a considerable decrease in neutron energy per collision.
• There are several methods of separating or concentrating DOD: (1) fractional distillation, (2) Girdler-Spevack process, (3) hydrogen-sulfide exchange process, (4) electrolysis, (5) cryogenic methane distillation.
• Non-confidential 2012 Chemical Data Reporting (CDR) information on the production and use of chemicals manufactured or imported into the United States. Chemical: Water-D2. National Production Volume: 18,369 lb/yr.
• The isotopes of hydrogen are probably the best known and most widely used nuclides, and have therefore been given individual names: (2)H is called deuterium and is abbreviated D; (3)H is called tritium and is abbreviated T.
• Substances that inhibit or prevent the proliferation of NEOPLASMS.

Synonyms

DEUTERIUM OXIDE; 7789-20-0; Heavy water; Deuterated water; Water-d2; Dideuterium oxide; Heavy water (D2O); Water-d sub(2); J65BV539M3; DTXSID4051243; CHEBI:41981; Oxide, Deuterium; RefChem:5735; DTXCID3029865; 232-148-9; Heavy water-d2

Frequently Asked Questions

What are the CAS number and molecular formula of Deuterium oxide?

CAS 7789-20-0; molecular formula H2O; molecular weight — g/mol.

What other names is Deuterium oxide known by?

DEUTERIUM OXIDE, 7789-20-0, Heavy water, Deuterated water, Water-d2, Dideuterium oxide.

Is Deuterium oxide classified as hazardous?

99.6% of GHS notifications report no hazard classification (226 of 227).

What are the key physical properties of Deuterium oxide?

Boiling Point: 101.42 °C; Melting Point: 3.81 °C; triple point 3.82 °C; Vapor Pressure: VP: 1.999 kPa at 20 °C; Vapor Pressure: 20.6 mm Hg at 25 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.