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. (iii) Heating in air: On heating in air, it forms phosphorous pentaoxide. Chemsrc provides Phosphorus trioxide(CAS#:1314-24-5) MSDS, density, melting point, boiling point, structure, formula, molecular weight etc. P 2 O 3 + 3H 2 O(cold) → 2H 3 PO 3 (phosphorus acid) White phosphorus ignites spontaneously in air so it is always kept under water. P2O3 (molecular formula P4O6) IUPAC name: phosphorus(III) oxide; former name: phosphorus trioxide. Articles of Phosphorus trioxide are included as well. As another has explained, phosphorous can be stored under water without reacting. [1]Phosphorus trioxide is the chemical compound with the molecular formula P4O6. 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. (ii) It is soluble in carbon disulphide, ether and chloroform. Phosphorus trioxide reacts with cold water to form phosphorous acid. The (III) is needed because there is phosphorus(V) oxide: P2O5 (molecular formula P4O10); former name: phosphorus pentoxide. Hot water produces a violent reaction with the formation of red phosphorus, phosphine, and H 3 PO 4. 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 … P 4 O 6 reacts with hydrogen chloride to form H 3 PO 3 and phosphorus trichloride. Phosphorous has several allotropes. bp 173.1° in nitrogen atm. Phosphorus trioxide reacts with cold water to form phosphorus acid and with hot water it forms phosphoric acid. It is the most stable of the diphosphorus tetrahalides. It also can be called Phosphorus oxide . Phosphorus trioxide ,its cas register number is 1314-24-5. Properties: Transparent monoclinic crystals or colorless liquid.Very poisonous! The vapour of phosphorus is condensed to a white solid under water to prevent oxidation. Properties of Phosphorus Trioxide (i) Phosphorus (III) oxide is a crystalline solid with garlic odour. The phosphorus oxides. Sol in benzene, carbon disulfide. 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. Disproportionates into red P and P 2 O 4 when heated above 210°. 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