Phosphorus Oxide-Phosphoric Acid

VX Mustard gas Lewisite Trichloroarsin, Hydrogen fluoride, Methylphosphonate Hydroxide chloride, Phosphorus oxides (Phosphoric acid)... 

Strong oxidzing agents, such as nitric acid (cold and concentrated), oxidize phosphorus to phosphoric acid. 

According to C. Wittstock,6 when nitric acid, ofsp.gr. 1-2, is warmed with phosphorus, nitrous and nitric oxides and a small quantity of free nitrogen are evolved, while phosphorus and phosphoric acids are formed. L. Gmelin said that no nitrous oxide is here produced and G. Watson, a colourless gas either nitrogen or in most... 

This compound melts at 23.9 °C and boils at 175.4 °C. Chemically, this oxide is the anhydride of phosphorous acid, H3P03. In the reaction with cold water, P406 does produce that acid. In hot water, disproportionation occurs and phosphine, phosphorus, and phosphoric acid are produced. At temperatures much above its boiling point, P406 decomposes into phosphorus and an oxide that can be described by the formula P 02 . 

The structures of the phosphorate products have not been established with certainty. They appear to contain an anhydride structure, since they react vigorously with water and with alcohols. Oxidative hydrolysis of the product from cyclohexene with 40% nitric acid liberates half of the phosphorus as phosphoric acid, and gives a phosphonic acid which can be isolated as the lead salt (28,32). The analysis of the lead salt is in agreement structure I (28,29>. It seems likely, however,... 

Phosphorus oxide chloride phosphorus pentoxide phosphoric acid... 

Nitrogen is the most abundant element in the atmosphere. Its major compounds are ammonia, hydrazine, and several oxides. Nitric acid, a strong oxidizing agent, is a major industrial chemical. Phosphorus is the other important element in Group 5A. It is a major component of teeth and bones and in genetic materials like deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). Phosphorus compounds include hydride and oxides. Phosphoric acid has many commercial applications. (21.4)... 

Wenzel is said to have described the blue mass formed with cobalt oxide and alumina, afterwards called Thenard s blue this had been noticed by Gahn (see Vol. Ill, p. 201). The process was described by Chaptal, who says he initiated the research by Thenard and Merime. Thenard investigated the oxides and salts of mercury, phosphates of soda and ammonia, nickel, compounds (alloys) of antimony and tin, oxides of iron and other metals, mordants, a supposed black phosphorus, and phosphorous acid (which he found contained 100 phosphorus +110 39 seep. 60). He obtained... 

Related Reagents. Dimethyl Sulfoxide-Phosphorus Pentox-ide Phosphorus(V) Oxide-Methanesulfonic Acid Phospho-rus(V) Oxide-Phosphoric Acid. 

Phosphorus(III) oxide dissolves slowly in cold water to yield phosphoric(III) acid, H3PO3 (phosphorous acid) ... 

Phosphorus. Eighty-five percent of the phosphoms, the second most abundant element in the human body, is located in bones and teeth (24,35). Whereas there is constant exchange of calcium and phosphoms between bones and blood, there is very Httle turnover in teeth (25). The Ca P ratio in bones is constant at about 2 1. Every tissue and cell contains phosphoms, generally as a salt or ester of mono-, di-, or tribasic phosphoric acid, as phosphoHpids, or as phosphorylated sugars (24). Phosphoms is involved in a large number and wide variety of metaboHc functions. Examples are carbohydrate metaboHsm (36,37), adenosine triphosphate (ATP) from fatty acid metaboHsm (38), and oxidative phosphorylation (36,39). Common food sources rich in phosphoms are Hsted in Table 5 (see also Phosphorus compounds). 

Phosphorus(III) Oxide. Phosphoms(III) oxide [12440-00-5] the anhydride of phosphonic acid, is formed along with by-products such as phosphoms pentoxide and red phosphoms when phosphoms is burned with less than stoichiometric amounts of oxygen (62). Phosphoms(III) oxide is a poisonous, white, wax-like, crystalline material, which has a melting point of 23.8°C and a boiling point of 175.3°C. When added to hot water, phosphoms(III) oxide reacts violentiy and forms phosphine, phosphoric acid, and red phosphoms. Even in cold water, disproportionation maybe observed if the oxide is not well agitated, resulting in the formation of phosphoric acid and yellow or orange poorly defined polymeric lower oxides of phosphoms (LOOP). 

About 80-90% of the elemental P produced is reoxidized to (pure) phosphoric acid (p. 521). The rest is used to make phosphorus oxides (p. 503). sulfides (p. 506), phosphorus chlorides and oxochloride (p. 4%). and organic P compounds. A small amount is convened to red phos rftorus (see below) for use in the striking surface of matches for pyrotechnics and as a flame retarding agent (in polyamides). Bulk price for P4 is S2.00/kg. 

Chlor-oxyd, n. chlorine oxide, -phosphor, m. phosphorus chloride, -pikrin, n. chloropicrin. -platin, n. platinic chloride, -platinsiiure,. chloroplatinic acid, -quecksilber, n. mercury chloride (either one), -raucherung, /. chlorine fumigation. 

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