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Molybdenum is a silver-white metallic powdered molybdenum gloss black. Melting point 2610 ℃, boiling point 5560 ℃, density 10.2 g / cm 3. Molybdenum is stable at room temperature in air, when the temperature was raised 600 ℃, quickly react with oxygen to produce the more volatile molybdenum trioxide. At 500 ~ 1150 ℃ reduction with hydrogen trioxide or ammonium molybdate, molybdenum available. 

 

MoO3 molecular weight of 143.94. White transparent rhombic crystals, to yellow when heated, cooled to restore the original color. Density 4.692g/cm3, melting point 795 ℃, boiling point 1155 ℃, easy sublimation. Insoluble in water, can be melted in a solution of ammonia and alkali generated molybdate. Dissolved in acid, molybdenum dioxide generated root (MoO22 +) and molybdenum oxide root (MoO4 +) complex cation to form a soluble complex with the acid group. Oxidizing very weak at high temperature may be hydrogen, carbon, aluminum reduction. Reagents for the analysis, molybdenum and molybdenum alloy salt preparation. Ignition or molybdenum or molybdenum disulfide to obtain calcined in air molybdate. 

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