Trioxide hydrate

What is the colour and composition of the tungsten trioxide hydrates Test the reaction of tungstic acids with 10% solutions of alkalies and acids. 

The sulfur trioxide is finally led into an absorber, where the gas is dissolved in concentrated sulfuric acid. This is necessary since sulfur trioxide does not dissolve readily in water or in dilute sulfuric acid. However, after the trioxide has been dissolved in concentrated acid and this solution is added to water, the trioxide hydrates to form sulfuric acid ... 

Fe203 H20 IRON TRIOXIDE HYDRATE (GOETHITE) 706 Ga2Te3 DIGALLIUM TRITELLURIDE 747... 

Np03 H20 NEPTUNIUM TRIOXIDE HYDRATE 1237 PbF[g] LEAD MONOFLUORIDE (GAS) 1284... 

Flame retardant (1947) n. A material that reduces the tendency of plastics to burn. Flame retardants are usually incorporated as additives during compounding, but sometimes applied to surfaces of finished articles. Some plasticizers, particularly the phosphate esters and chlorinated paraffins, also serve as flame retardants. Inorganic flame retardants include antimony trioxide, hydrated alumina, monoammonium phosphate, dicyandiamide, zinc borate, boric acid, and ammonium sulfamate. Another... 

Fig.4.9 Sulfur trioxide hydration leads to sulfuric acid...

Shao, Z. G., H. F. Xu, I. M. Hsing, and H. M. Zhang, 2007. Tungsten trioxide hydrate incorporated Nafion composite membrane for proton exchange membrane fuel cells operated above 100 degrees C. Chem Eng Commun 194 667-74. 

Flame Retardant n (1947) A material that reduces the tendency of plastics to burn. Flame retardants are usually incorporated as additives during compounding, but sometimes applied to surfaces of finished articles. Some plasticizers, particularly the phosphate esters and chlorinated paraffins, also serve as flame retardants. Inorganic flame retardants include antimony trioxide, hydrated alumina, monoammonium phosphate, dicyandiamide, zinc borate, boric acid, and ammonium sulfamate. Another group, called reactive-type flame retardants, includes bromine-containing polyols, Chlorendic acid and anhydride, tetrabromo- and tetrachlorophthalic anhydride, tetrabromo bisphenol A, diallyl chlorendate, and unsaturated phosphonated chlorophenols. A few neat resins, such as PVC and the fluoro- and chlorofluo-rocarbons, are flame-retardant (Elias, H (2003) An introduction to plastics. Wiley, New York Modem plastics encyclopedia. McGraw-Hill/Modem Plastics, New York, 1986 1990, 1992, 1993 editions). See Flammability. 

Kumagai N, Kumagai N, Tanno K (1988) Electrochemical characteristics ans structural changes of molybdenum trioxide hydrates as cathode materials for lithium batteries. J Appl Electrochem 18 857-862... 

Flame and Smoke Retardants. Molybdenum compounds are used extensively as flame retardants (qv) (93,94) in the formulation of halogenated polymers such as PVC, polyolefins, and other plastics elastomers and fabrics. An incentive for the use of molybdenum oxide and other molybdenum smoke and flame retardants is the elimination of the use of arsenic trioxide. Although hydrated inorganics are often used as flame retardants, and thought to work by releasing water of crystallization, anhydrous molybdenum oxides are effective. Presumably the molybdenum oxides rapidly form... 

Gas leaving the economizer flows to a packed tower where SO is absorbed. Most plants do not produce oleum and need only one tower. Concentrated sulfuric acid circulates in the tower and cools the gas to about the acid inlet temperature. The typical acid inlet temperature for 98.5% sulfuric acid absorption towers is 70—80°C. The 98.5% sulfuric acid exits the absorption tower at 100—125°C, depending on acid circulation rate. Acid temperature rise within the tower comes from the heat of hydration of sulfur trioxide and sensible heat of the process gas. The hot product acid leaving the tower is cooled in heat exchangers before being recirculated or pumped into storage tanks. 

Antimony trioxide is insoluble in organic solvents and only very slightly soluble in water. The compound does form a number of hydrates of indefinite composition which are related to the hypothetical antimonic(III) acid (antimonous acid). In acidic solution antimony trioxide dissolves to form a complex series of polyantimonic(III) acids freshly precipitated antimony trioxide dissolves in strongly basic solutions with the formation of the antimonate ion [29872-00-2] Sb(OH) , as well as more complex species. Addition of suitable metal ions to these solutions permits formation of salts. Other derivatives are made by heating antimony trioxide with appropriate metal oxides or carbonates. 

Bismuth trioxide may be prepared by the following methods (/) the oxidation of bismuth metal by oxygen at temperatures between 750 and 800°C (2) the thermal decomposition of compounds such as the basic carbonate, the carbonate, or the nitrate (700—800°C) (J) precipitation of hydrated bismuth trioxide upon addition of an alkah metal hydroxide to a solution of a bismuth salt and removal of the water by ignition. The gelatinous precipitate initially formed becomes crystalline on standing it has been represented by the formula Bi(OH)2 and called bismuth hydroxide [10361 -43-0]. However, no definite compound has been isolated. 

Hydroxides are not well-eharaeterized but gelantinous preeipitates, whieh redissolve in aeid, are produeed by the addition of alkali to aqueous solutions of the aetinides. Those of Th, Pa, Np, Pu, Am and Cm are stable to oxidation but lower oxidation states of these metals are rapidly oxidized. Aqueous solutions of hexavalent U, Np and Pu yield hydrous preeipitates of An02(0H)2, whieh eontain An02 units linked by OH bridges, but they are often formulted as hydrated trioxides An03.xH20. 

Flame retardants Antimony trioxide with chlorinated or brominated organics, hydrated alumina... 

The hydrated oxide is prepared by hydrolysis of antimony pentachloride or by acidification of potassium hexahydroxoantimonate(V), KSb(OH)6 [12208-13-8]. The product, filtered and air dried at ambient temperature has approximate composition 86205 3.5H2O. It may be also prepared by oxidation of antimony trioxide with nitric acid. 

Hydrated nickel sulfate on heating at 103°C loses all of its water molecules. At 848°C, the anhydrous sulfate decomposes to nickel oxide and sulfur trioxide ... 

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