P2O5 Phosphorus oxide

Phosphorus pentoxide [P2O5] Phosphorus oxide (8, 9) (1314-56-3) Lithium aluminum hydride Aluminate(l-). tetrahydro-, lithium (8) Alu-minate(l-), tetrahydro-, lithium, (7-4)- (9), (16853-85-3)... 

Ethyl acetate (500 mL) is purified by washing with 100 mL of 5% sodium carbonate solution, followed by 100 mL of saturated sodium chloride solution, drying over potassium carbonate and filtering. It is then heated at reflux over phosphorus oxide P2O5) for 3-12 hr and distilled from P2O5.3... 

Chloroform was purchased from Fisher Scientific Company and distilled from phosphorus oxide (P2O5) immediately before use and added to the reaction mixture via syringe. 

White phosphorus reacts with oxygen to produce an oxide (P2O5). This oxide then reacts with any water that is around to form phosphoric acid. The phosphorus-phosphorus bonds of P4 are weak compared with the stronger phosphorus-oxygen bonds of P2O5 in other words, the oxide is thermodynamically much more stable than white phosphorus, and this drives the reaction to such an extent that white phosphorus spontaneously combusts in air. 

Approximately 2-3 mL of nitrosyl chloride (either freshly prepared or purchased from Matheson of Canada, Whitby, Ontario) is condensed into a 5-mL graduated cold trap held at -78°. It is then allowed to melt so that its volume can be measured, and it is distilled under static vacuum into a lOO-mL, twonecked flask held at -78°. Approximately 30-40 mL of dichloromethane [Fisher Scientific Co. reagent grade freshly distilled from phosphorus oxide (P2O5) and deaerated with nitrogen] is syringed into this flask, and the resulting red solution is stored at -18° until just prior to use when it is allowed to warm to room temperature. 

P2O5 (phosphorus(V) oxide, phosphorus pentoxide) m.p., 580°C under pressure. It sublimes at 360°C and reacts violently with water, forming phosphoric acid. It is used as a drying agent and as a dehydrating agent. 

This oxide was originally given the formula P2O5 and called phosphorus pentoxide but the vapour density and structure indicate the formula P40,q. It is prepared by burning phosphorus in a plentiful supply of air or oxygen ... 

METHOD 2 [113]-Phenol can be oxidized with either performic, formic or acetic acids to catechol. For example phenol, formic acid, concentrated H2O2 and polyphosphoric acid are heated 2 hours at 80 C to give 53% catechoi. Addition of phosphorus pen-toxide (P2O5) is said to increase the yieid. 

Examples P2O5, diphosphorus pentaoxide or phosphorus)V) oxide Hgj, mercury(I) ion or dimercury(2-l-) ion K2[Fe(CN)g], potassium hexacyanoferrate(II) or potassium hexacyanofer-rate(4—) PbJPb 04, dilead(II) lead(IV) oxide or trilead tetraoxide. 

Formula P2O5 MW 141.95 exists as P4O10 units as molecular entities Synonyms phosphorus pentaoxide phosphorus(V) oxide phosphoric anhydride... 

The tetrahedral phosphate ion PO43-, like the silicate ion with which it is isoelectronic, can form chains and networks, and indeed its parent oxide, a white, extremely hygroscopic solid commonly called phosphorus pentoxide (P2O5), consists of discrete P4O10 molecular units in which four PO4 units each share three corner oxygens such that the four P centers themselves form a tetrahedron. We customarily distinguish the following classes of phosphates ... 

There arc two main processes for the industrial production of phosphoric add, H3PO4. from phosphate rock (1) the wet process which involves tlie reaction of phosphate rock with H2SO4 to yield phosphoric acid and insoluble calcium sulfites, Several of the impurities present in the rock dissolve and remain with the product add. These are not important when the add is used for fertilizer manufacture. However, the impurities are deleterious to the manufacture of phosphorus chemicals. For a purer product, (2) the furnace process is used, wherein the phosphate rock is combined with coke and silica, producing elemental phosphorus as previously described. Oxidation of the phosphorus produces P2O5 which, when combined with H2O, yields H3PO4. 

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