Phosphorus trioxide is the chemical compound with the molecular formula P4O6. (ii) It is soluble in carbon disulphide, ether and chloroform. The phosphorus oxides. (iii) Heating in air: On heating in air, it forms phosphorous pentaoxide. It also can be called Phosphorus oxide . Properties of Phosphorus Trioxide (i) Phosphorus (III) oxide is a crystalline solid with garlic odour. 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. Chemsrc provides Phosphorus trioxide(CAS#:1314-24-5) MSDS, density, melting point, boiling point, structure, formula, molecular weight etc. White phosphorus ignites spontaneously in air so it is always kept under water. d 421 2.135. mp 23.8°. 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. Articles of Phosphorus trioxide are included as well. 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. Phosphorus trioxide. bp 173.1° in nitrogen atm. Sol in benzene, carbon disulfide. P 2 O 3 + 3H 2 O(cold) → 2H 3 PO 3 (phosphorus acid) Disproportionates into red P and P 2 O 4 when heated above 210°. Phosphorus trioxide reacts with cold water to form phosphorus acid and with hot water it forms phosphoric acid. P 4 O 6 reacts with hydrogen chloride to form H 3 PO 3 and phosphorus trichloride. Properties: Transparent monoclinic crystals or colorless liquid.Very poisonous! Hot water produces a violent reaction with the formation of red phosphorus, phosphine, and H 3 PO 4. Phosphorus trioxide ,its cas register number is 1314-24-5. Although it should properly be named tetraphosphorus hexoxide, the name phosphorus trioxide preceded the knowledge of the … As another has explained, phosphorous can be stored under water without reacting. P2O3 (molecular formula P4O6) IUPAC name: phosphorus(III) oxide; former name: phosphorus trioxide. Phosphorus trioxide reacts with cold water to form phosphorous acid. It is the most stable of the diphosphorus tetrahalides. When we talk about the acidity of the oxides increasing as you go from, say, phosphorus(V) oxide to sulphur trioxide to chlorine(VII) oxide, what we are normally talking about is the increasing strengths of the acids formed when they react with water. Note the spelling of phosphorus and that there is no space between the element name and its oxidation state. P 4 O 6 (s) + 6 H 2 O(l) → 4 H 3 PO 3 (aq) It reacts vigorously with hot water, via a complex set of reactions, to form red phosphorus, phosphines, H 3 PO 3 and H 3 PO 4. 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