Phosphorus trioxide reacts with cold water to form phosphorous acid. Phosphorous has several allotropes. [1]Phosphorus trioxide is the chemical compound with the molecular formula P4O6. 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. When placed in cold water, H 3 PO 3 is formed slowly. 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. d 421 2.135. mp 23.8°. Sol in benzene, carbon disulfide. (iii) Heating in air: On heating in air, it forms phosphorous pentaoxide. 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. 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. Properties of Phosphorus Trioxide (i) Phosphorus (III) oxide is a crystalline solid with garlic odour. Phosphorus trioxide reacts with cold water to form phosphorus acid and with hot water it forms phosphoric acid. As another has explained, phosphorous can be stored under water without reacting. 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°. It is the most stable of the diphosphorus tetrahalides. P 2 O 3 + 3H 2 O(cold) → 2H 3 PO 3 (phosphorus acid) Articles of Phosphorus trioxide are included as well. The phosphorus oxides. P2O3 (molecular formula P4O6) IUPAC name: phosphorus(III) oxide; former name: phosphorus trioxide. Properties: Transparent monoclinic crystals or colorless liquid.Very poisonous! The (III) is needed because there is phosphorus(V) oxide: P2O5 (molecular formula P4O10); former name: phosphorus pentoxide. 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. (ii) It is soluble in carbon disulphide, ether and chloroform. bp 173.1° in nitrogen atm. Note the spelling of phosphorus and that there is no space between the element name and its oxidation state. 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