It also can be called Phosphorus oxide . P2O3 (molecular formula P4O6) IUPAC name: phosphorus(III) oxide; former name: phosphorus trioxide. Phosphorus trioxide reacts with cold water to form phosphorus acid and with hot water it forms phosphoric acid. Articles of Phosphorus trioxide are included as well. It is the most stable of the diphosphorus tetrahalides. Although it should properly be named tetraphosphorus hexoxide, the name phosphorus trioxide preceded the knowledge of the … The (III) is needed because there is phosphorus(V) oxide: P2O5 (molecular formula P4O10); former name: phosphorus pentoxide. (iii) Heating in air: On heating in air, it forms phosphorous pentaoxide. bp 173.1° in nitrogen atm. The vapour of phosphorus is condensed to a white solid under water to prevent oxidation. [1]Phosphorus trioxide is the chemical compound with the molecular formula P4O6. It reacts slowly with cold water to give phosphorous acid and vigorously with hot water to generate red phosphorus, phosphine (highly toxic and flammable) and phosphoric acid. P 4 O 6 reacts with hydrogen chloride to form H 3 PO 3 and phosphorus trichloride. White phosphorus ignites spontaneously in air so it is always kept under water. Phosphorus trioxide. Phosphorus trioxide definition is - a deliquescent volatile crystalline compound P4O6 that is made by burning phosphorus in a limited supply of air or oxygen, that reacts with cold water to form phosphorous acid, and that decomposes with hot water; tetra-phosphorus … Disproportionates into red P and P 2 O 4 when heated above 210°. Phosphorus trioxide ,its cas register number is 1314-24-5. Properties of Phosphorus Trioxide (i) Phosphorus (III) oxide is a crystalline solid with garlic odour. d 421 2.135. mp 23.8°. Sol in benzene, carbon disulfide. Note the spelling of phosphorus and that there is no space between the element name and its oxidation state. Phosphorus trioxide is the chemical compound with the molecular formula P4O6. The phosphorus oxides. (ii) It is soluble in carbon disulphide, ether and chloroform. Phosphorous has several allotropes. Although the molecular formula suggests the name tetraphosphorus hexoxide, the name phosphorus trioxide preceded the knowledge of the compound's molecular structure, and its usage continues today. Chemsrc provides Phosphorus trioxide(CAS#:1314-24-5) MSDS, density, melting point, boiling point, structure, formula, molecular weight etc. Hot water produces a violent reaction with the formation of red phosphorus, phosphine, and H 3 PO 4. As another has explained, phosphorous can be stored under water without reacting. When placed in cold water, H 3 PO 3 is formed slowly. Phosphorus trioxide reacts with cold water to form phosphorous acid. 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