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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 … Properties of Phosphorus Trioxide (i) Phosphorus (III) oxide is a crystalline solid with garlic odour. P 2 O 3 + 3H 2 O(cold) → 2H 3 PO 3 (phosphorus acid) 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. Hot water produces a violent reaction with the formation of red phosphorus, phosphine, and H 3 PO 4. P 4 O 6 reacts with hydrogen chloride to form H 3 PO 3 and phosphorus trichloride. Although it should properly be named tetraphosphorus hexoxide, the name phosphorus trioxide preceded the knowledge of the … It also can be called Phosphorus oxide . Phosphorus trioxide reacts with cold water to form phosphorous acid. Chemsrc provides Phosphorus trioxide(CAS#:1314-24-5) MSDS, density, melting point, boiling point, structure, formula, molecular weight etc. The (III) is needed because there is phosphorus(V) oxide: P2O5 (molecular formula P4O10); former name: phosphorus pentoxide. [1]Phosphorus trioxide is the chemical compound with the molecular formula P4O6. P2O3 (molecular formula P4O6) IUPAC name: phosphorus(III) oxide; former name: phosphorus trioxide. d 421 2.135. mp 23.8°. The vapour of phosphorus is condensed to a white solid under water to prevent oxidation. Articles of Phosphorus trioxide are included as well. Disproportionates into red P and P 2 O 4 when heated above 210°. Sol in benzene, carbon disulfide. Properties: Transparent monoclinic crystals or colorless liquid.Very poisonous! (ii) It is soluble in carbon disulphide, ether and chloroform. It is the most stable of the diphosphorus tetrahalides. When placed in cold water, H 3 PO 3 is formed slowly. Phosphorus trioxide. 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. bp 173.1° in nitrogen atm. (iii) Heating in air: On heating in air, it forms phosphorous pentaoxide. White phosphorus ignites spontaneously in air so it is always kept under water. Phosphorus trioxide is the chemical compound with the molecular formula P4O6. Phosphorus trioxide reacts with cold water to form phosphorus acid and with hot water it forms phosphoric acid. 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. Note the spelling of phosphorus and that there is no space between the element name and its oxidation state. 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