Hydrogen the molybdenum trioxide hydrogen molybdenum oxide chemical formula: The prevalence of a hydroxide of molybdenum Mo (OH) molybdenum (trihydroxy molybdenum) Mo (OH) 3, tetrahydro molybdenum oxide (tetrahydroxy molybdenum) Mo (OH) 4 oxide trihydro five hydrogen molybdenum oxide, (five hydroxyl molybdenum). Mo (OH) 5. Three hydrogen molybdenum oxide, molybdenum oxide hydrates exist Mo2O3 · 3H2O. Brown or almost black amorphous powder. Insoluble in water and alkali. The very insoluble inorganic acid. A compressed state can be conductive. The air heated in the hot solution is easily oxidized to molybdenum (VI), dissolved in 30% hydrogen peroxide. Heating the reaction obtained by the Mo (III) compound with sodium hydroxide (or ammonia). Tetrahydro molybdenum oxide black precipitate. By molybdenum (IV) with ammonia or by the molybdenum metal in the electrolysis system in an aqueous solution of potassium hydroxide. Also can be used and ammonium paramolybdate hydrogen in helium atmosphere with a reduction in the system. The five hydrogen molybdenum oxide freshly prepared precipitate a tan gradually turned brown trihydroxy molybdenum oxide MoO (OH) 3. Insoluble in water. Insoluble inorganic acid. Heating becomes pentoxide molybdenum. By electrochemical control (or hydroiodic acid) reducing an aqueous solution of the Mo (VI) compounds, or with a metal such as silver, mercury, after reduction of the acidic solution will Mo (IV) compound with ammonia or an alkali, and much. For the preparation of various molybdenum compounds