Ammonium Molybdate

	Ammonium Molybdate Ammonium molybdate can refer to: Ammonium orthomolybdate, (NH4)2MoO4 Ammonium heptamolybdate, (NH4)6Mo7O24, usually encountered as the tetrahydrate * Ammonium phosphomolybdate, (NH4)3PMo12O40 Ammonium tetrathiomolybdate, (NH4)2MoS4 this chemical is used for analysis of chloride in a solution See also Ammonium dimolybdate Ammonium dimolybdate (ADM) is the inorganic compound with the formula (NH4)2Mo2O7. It is a white, water-soluble solid. ADM is an intermediate in the production of molybdenum compounds from its ores. Roasting typical ore produces crude molybdenum( ..., (NH4)2Mo2O7 {{Chemistry index ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Ammonium Orthomolybdate Ammonium orthomolybdate is the inorganic compound with the chemical formula (NH4)2MoO4. It is a white solid that is prepared by treating molybdenum trioxide with aqueous ammonia. Upon heating these solutions, ammonia is lost, to give ammonium heptamolybdate ((NH4)6Mo7O24·4H2O). Uses Ammonium orthomolybdate is used as a corrosion inhibitor and is an intermediate in some schemes to win molybdenum from its ores.Roger F. Sebenik et al. "Molybdenum and Molybdenum Compounds" in Ullmann's Encyclopedia of Chemical Technology 2005; Wiley-VCH, Weinheim. It is also used for decorating ceramics, and for colorimetric analysis of phosphates and arsenates. Chemical reactions Heating ammonium orthomolybdate solid or treatment with acid gives molybdenum trioxide. Such reactions proceed via ammonium dimolybdate. This equilibrium is exploited in the purification of molybdenum from its ores. Aqueous solutions of ammonium orthomolybdate react with hydrogen sulfide to give ammonium tetrathiomol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Ammonium Heptamolybdate Ammonium heptamolybdate is the inorganic compound whose chemical formula is (NH4)6Mo7O24, normally encountered as the tetrahydrate. A dihydrate is also known. It is a colorless solid, often referred to as ammonium paramolybdate or simply as ammonium molybdate, although "ammonium molybdate" can also refer to ammonium orthomolybdate, (NH4)2MoO4, and several other compounds. It is one of the more common molybdenum compounds. Synthesis Ammonium heptamolybdate is easily prepared by dissolving molybdenum trioxide in an excess of aqueous ammonia and evaporating the solution at room temperature. While the solution evaporates, the excess of ammonia escapes. This method results in the formation of six-sided transparent prisms of the tetrahydrate of ammonium heptamolybdate. Solutions of ammonium paramolybdate react with acids to form molybdic acid and an ammonium salt. The pH value of a concentrated solution will lie between 5 and 6. Structure The compound was first analyzed crystallogra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Ammonium Phosphomolybdate Ammonium phosphomolybdate is the inorganic salt of phosphomolybdic acid with the chemical formula (NH4)3PMo12O40. The salt contains the phosphomolybdate anion, a well known heteropolymetalate of the Keggin structural class. Synthesis Ammonium phosphomolybdate can be made by heating ammonium orthomolybdate combined with phosphoric acid and nitric acid, yielding ammonium nitrate, water, and a yellow precipitate In an aqueous solution, precipitation is the process of transforming a dissolved substance into an insoluble solid from a super-saturated solution. The solid formed is called the precipitate. In case of an inorganic chemical reaction leading ... of ammonium phosphomolybdate is obtained. : Normally, it often is as a hexahydrate, which is a dark yellow fine crystal, and poorly soluble in water. References {{Ammonium salts Ammonium compounds Molybdates Inorganic phosphorus compounds Heteropoly acids ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Ammonium Tetrathiomolybdate Ammonium tetrathiomolybdate is the chemical compound with the formula (NH4)2MoS4. This bright red ammonium salt is an important reagent in the chemistry of molybdenum and has been used as a building block in bioinorganic chemistry. The thiometallate anion has the distinctive property of undergoing oxidation at the sulfur centers concomitant with reduction of the metal from Mo(VI) to Mo(IV). Preparation and structure The salt contains the tetrahedral oS4sup>2− anion. The compound is prepared by treating solutions of molybdate, oO4sup>2− with hydrogen sulfide in the presence of ammonia: :(NH4)2MoO4 + 4 H2S → (NH4)2MoS4 + 4 H2O Reactions The anion is also an excellent ligand. For example, with Ni(II) sources, it forms i(MoS4)2sup>2−. Much of the chemistry of the thiomolybdate results from studies on salts of quaternised organic cations, such as Et4sub>2 oS4and Ph4sub>2 oS4(Et = C2H5, Ph = C6H5). These organic salts are soluble in polar organic solvents such as acetoni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]