Basic information
- CAS
1314-24-5- Standard SMILES
O=POP=O- InChIKey
XDJWZONZDVNKDU-UHFFFAOYSA-N- Molecular formula
- P2.O3
- Average molar mass
- 109.946 g/mol
- Monoisotopic mass
- 109.93226712
Overview
Phosphorus trioxide appears as white crystalline solid or a liquid (melting point 24 °C). Density 2.14 g / cm3. Toxic and corrosive. May severely irritate skin and eyes. Used to make other chemicals.
Names & identifiers
- Preferred name
- Phosphorus trioxide
- IUPAC
- Diphosphoxane-1,3-dione
- English name
- Phosphorus trioxide
- Molecular formula
- H4O5P2
- Molecular weight
- 145.976282
Names & synonyms
Phosphorus trioxideDiphosphorus trioxide1314-24-5UNII-0LTR52K7HK0LTR52K7HKUN2578Phosphorus sesquioxidePHOSPHORUS TRIOXIDE [MI]DTXSID00895014UN-2578RefChem:173925DTXCID701324573
Show more names
phosphorous anhydridePhosphorus trioxide ISO 9001：2015 REACH
PHOSPHORUS OXIDE (P2O3)Diphosphortrioxidphosphorous trioxideDiphosphoxane-1,3-dioneSCHEMBL901609Phosphorus trioxide [UN2578] [Corrosive]
Database identifiers
- CAS
1314-24-5- PubChem CID
- 14810
- DTXSID
DTXSID00895014- UNII
- 0LTR52K7HK
Properties
Computed structural properties
- XLogP
- -1
- Topological polar surface area
- 43.4 Ų
- Hydrogen bond donors
- 0
- Hydrogen bond acceptors
- 3
- Rotatable bonds
- 0
- Heavy atoms
- 5
- Formal charge
- 0
- Complexity
- 34.2
Experimental & physicochemical properties
Chemical ClassesCorrosives
Density2.135 @ 21°C
Boiling Point173.1 °C @760 [mm Hg]
Melting Point23.8 °C
Physical DescriptionPhosphorus trioxide appears as white crystalline solid or a liquid (melting point 24 °C). Density 2.14 g / cm3. Toxic and corrosive. May severely irritate skin and eyes. Used to make other chemicals.
Physicochemical properties
- Melting point
- 23.8 ° · 23.8°
- Boiling point
- 173.1 ° · bp 173.1° in nitrogen atm
- Density
- 421 · d421 2.135
- solubility
- 2 O · reacts with H2O
- form
- colorless monoclinic crystals or liquid
- color
- colorless monoclinic crystals, crystalline or liquid
- Water Solubility
- 3 PO3 · slowly forms H3PO3 in cold H2O; reacts violently in hot H2O forming red P, PH3, and H3PO4 [MER06]
- crystal system
- Monoclinic
- Space group
- 21 · P21/m
- Lattice constant
- a/nm
- RIDADR
- 2578 · UN 2578
- HazardClass
- 8 · 8
- PackingGroup
- III
Safety & regulation
Hazard information
Regulatory InformationThe New Jersey Worker and Community Right to Know Act requires public and private employers to provide information about hazardous substances at their workplaces. (N.J.S.A. 34:5A-1 et. seq.)
DOT LabelCorrosive
Fire Hazards
Excerpt from ERG Guide 157 [Substances - Toxic and/or Corrosive (Non-Combustible / Water-Sensitive)]:
· Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.
Health Hazards
Excerpt from ERG Guide 157 [Substances - Toxic and/or Corrosive (Non-Combustible / Water-Sensitive)]:
· TOXIC and/or CORROSIVE; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance may cause severe injury, burns or death.
DOT ID and Guide2578 157
Reactive GroupAcids, Strong Non-oxidizing
Reactivity AlertsWater-Reactive
Reactivity Profile
PHOSPHORUS TRIOXIDE reacts exothermically with bases. Melted phosphorus trioxide readily ignites in air. Instantly ignites with a flame of almost blinding brilliance when thrown into oxygen at 50-60 °C [J. Am. Chem. Soc. 125:347. 1924]. Incompatible with ammonia, disulfur dichloride, halogens, oxygen, phosphorus pentachloride, sulfur, sulfuric acid, water [Bretherick, 5th ed., 1995, p. 1778].
DOT Hazard Classification
Phosphorus trioxide
UN2578
Class 8 Corrosive material (49 eCFR § 173.136)
PG III: the degree of danger presented by the material is minor
Air and Water ReactionsFumes in air. Reacts slowly with cold water to give phosphorous acid. Reacts vigorously with hot water to generate red phosphorus, phosphine (highly toxic and flammable) and phosphoric acid [Merck 11th ed. 1989].
Hazard Classes and CategoriesCorrosives
Safety & protection
Fire FightingExcerpt from ERG Guide 157 [Substances - Toxic and/or Corrosive (Non-Combustible / Water-Sensitive)]:
Accidental Release Measures
· CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper not available or no answer, refer to appropriate telephone number listed on the inside back cover.
· ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area.
First Aid
Excerpt from ERG Guide 157 [Substances - Toxic and/or Corrosive (Non-Combustible / Water-Sensitive)]:
General First Aid:
Exposure Control and Personal Protection· Wear positive pressure self-contained breathing apparatus (SCBA).
Nonfire Spill ResponseExcerpt from ERG Guide 157 [Substances - Toxic and/or Corrosive (Non-Combustible / Water-Sensitive)]:
Isolation and Evacuation
Excerpt from ERG Guide 157 [Substances - Toxic and/or Corrosive (Non-Combustible / Water-Sensitive)]:
Immediate precautionary measure
Protective Action Criteria (PAC)
1.2 [mg/m3]
13 [mg/m3]
79 [mg/m3]
Personal Protective Equipment (PPE)Excerpt from ERG Guide 157 [Substances - Toxic and/or Corrosive (Non-Combustible / Water-Sensitive)]:
Emergency Response Planning Guidelines· Note: Some foams will react with the material and release corrosive/toxic gases.
Safety data
- ridadr
- UN 2578
- hazard_class
- 8
- packing_group
- III
Chemistry & industry
Applications
General DescriptionWhite crystalline solid or a liquid (melting point 24°C). Density 2.14 g / cm3. Toxic and corrosive. May severely irritate skin and eyes. Used to make other chemicals.
Upstream & downstream products
Downstream products
Suppliers11 total
上海德铼钶医药科技有限公司17351445187
广东翁江化学试剂有限公司0751-2815987 13927875076 · [email protected]
启源（广东）医药化工有限公司18026564465 · [email protected]
陕西缔都医药化工有限公司+86-29-81139210 +86-17392587031 · [email protected]
上海出澄贸易有限公司021-5983532 15201998618 · [email protected]
厦门盈融达化工有限公司+86-0592-6210733 · [email protected]
湖南秉航新材料有限公司0731-85567275 19313119732 · [email protected]
爆牛贸易重庆有限公司+86-023-6139-8061 +86-86-13650506873 · [email protected]
上海宝杨宝欣生物科技有限公司021-56698539 19921169802 · [email protected]
Hefei TNJ Chemical Industry Co.,Ltd.+86-0551-65418671 +86-189 4982 3763 · [email protected]
山东彬睿特新材料有限公司0533-2866658 15615638350 · [email protected]
Related reactions
5 records
Compound notes
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