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Phosphorus pentoxide

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Phosphorus pentoxide is a chemical compound with molecular formula P4O10 (with its common name derived from its empirical formula, P2O5). This white crystalline solid is the anhydride of phosphoric acid. It is a powerful desiccant and dehydrating agent.

Quick facts: Names, Identifiers, Properties, Hazards... ▼
Phosphorus pentoxide
Phosphorus pentoxide
Phosphorus pentoxide
Phosphorus pentoxide
Phosphorus pentoxide
Sample_of_Phosphorus_pentoxide.jpg
Names
Other names
Diphosphorus pentoxide
Phosphorus(V) oxide
Phosphoric anhydride
Tetraphosphorus decaoxide
Tetraphosphorus decoxide
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.013.852 Edit this at Wikidata
RTECS number
  • TH3945000
UNII
  • InChI=1S/O10P4/c1-11-5-12(2)8-13(3,6-11)10-14(4,7-11)9-12 checkY
    Key: DLYUQMMRRRQYAE-UHFFFAOYSA-N checkY
  • molecular form: O=P13OP2(=O)OP(=O)(O1)OP(=O)(O2)O3
  • crystal o′ form: P12(=O)OP3(=O)OP4(=O)OP5(=O)OP6(=O)OP(=O)(O1)OP7(=O)OP(=O)OP(=O)OP(=O)(O2)OP(=O)OP(=O)OP(=O)(O3)OP(=O)OP(=O)OP(=O)(O4)OP(=O)OP(=O)OP(=O)(O5)OP(=O)OP(=O)OP(=O)(O6)OP(=O)OP(=O)(O7)O
Properties
P4O10
Molar mass 283.9 g mol−1
Appearance White powder
Very deliquescent
Odor Odorless
Density 2.39 g/cm3
Melting point 340 °C (644 °F; 613 K)
Boiling point 360 °C (sublimes)
exothermic hydrolysis
Vapor pressure 1 mmHg @ 385 °C (stable form)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 reacts with water, strong dehydrating agent, corrosive
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 0: Will not burn. E.g. waterInstability 3: Capable of detonation or explosive decomposition but requires a strong initiating source, must be heated under confinement before initiation, reacts explosively with water, or will detonate if severely shocked. E.g. hydrogen peroxideSpecial hazard W: Reacts with water in an unusual or dangerous manner. E.g. sodium, sulfuric acid
3
0
3
W
Safety data sheet (SDS) MSDS
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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