Chemical elements
    Physical Properties
    Chemical Properties
      Molybdenum Hexafluoride
      Molybdenum Dichloride
      Molybdenum Trichloride
      Molybdenum Tetrachloride
      Molybdenum Pentachloride
      Molybdenum Oxychlorides
      Chlormolybdic Acids
      Molybdenum Dibromide
      Molybdenum Tribromide
      Molybdenum Tetrabromide
      Molybdenum Oxybromide
      Molybdenum Di-iodide
      Molybdenum Oxyiodide
      Iodomolybdic Acid
      Molybdenum Sesquioxide
      Molybdenum Dioxide
      Molybdenum Oxide Blue
      Molybdenum Trioxide
      Aluminium Molybdates
      Ammonium Molybdate
      Ammonium Dimolybdate
      Ammonium Paramolybdate
      Ammonium Trimolybdate
      Ammonium Tetramolybdate
      Ammonium Octamolybdate
      Barium Molybdates
      Barium Paramolybdate
      Barium Trimolybdate
      Barium Tetramolybdate
      Barium Octamolybdate
      Barium Nonamolybdate
      Beryllium Molybdate
      Bismuth Molybdates
      Cadmium Molybdates
      Caesium Molybdates
      Calcium Molybdate
      Calcium Trimolybdate
      Calcium Tetramolybdate
      Calcium Octamolybdate
      Chromium Molybdates
      Cobalt Molybdates
      Cobalt Dimolybdate
      Cobalt Trimolybdate
      Copper Molybdates
      Ferrous Molybdate
      Ferric Molybdate
      Indium Molybdate
      Lead Molybdates
      Lithium Molybdate
      Lithium Dimolybdate
      Lithium Paramolybdate
      Lithium Trimolybdate
      Lithium Tetramolybdate
      Magnesium Molybdates
      Magnesium Paramolybdate
      Magnesium Trimolybdate
      Manganese Molybdate
      Mercurous Molybdates
      Nickel Molybdates
      Potassium Molybdate
      Potassium Dimolybdate
      Potassium Paramolybdate
      Potassium Trimolybdate
      Potassium Tetramolybdate
      Potassium Octamolybdate
      Potassium Decamolybdate
      Rhodium Molybdates
      Rubidium Molybdate
      Rubidium Dimolybdate
      Rubidium Paramolybdate
      Rubidium Trimolybdate
      Rubidium Tetramolybdates
      Silver Molybdates
      Normal Silver Molybdate
      Sodium Molybdate
      Sodium Dimolybdate
      Sodium Paramolybdate
      Sodium Trimolybdate
      Sodium Tetramolybdate
      Sodium Iodomolybdate
      Strontium Molybdate
      Thallous Molybdate
      Thallous Paramolybdate
      Thallous Tetramolybdate
      Thorium Molybdate
      Uranium Molybdates
      Uranyl Octamolybdate
      Zinc Molybdates
      Zinc Trimolybdate
      Zinc Tetramolybdate
      Zinc Octamolybdate
      Zirconium Molybdate
      Permolybdic Acid
      Molybdenum Sesquisulphide
      Molybdenum Disulphide
      Dimolybdenum Pentasulphide
      Molybdenum Trisulphide
      Molybdenum Tetrasulphide
      Ammonium Thiomolybdates
      Ammonium Molybdosulphites
      Potassium Thiomolybdate
      Potassium Thiodimolybdate
      Potassium Dithiodioxymolybdate
      Potassium Molybdosulphite
      Sodium Thiomolybdates
      Sodium Molybdosulphites
      Molybdenum Sulphates
      Molybdenum Selenide
      Complex Molybdoselenites
      Chromates of Molybdenum
      Molybdenum Phosphide
      Molybdic Metaphosphate
      Heteropoly-compounds with Phosphorus
      12-Molybdophosphoric Acid
      9-Molybdophosphoric Acid
      172-Molybdophosphoric Acid
      Molybdenum Carbides
      Molybdenum Carbonyl
      Reddish-violet Salts
      Yellow Salts
      Thiocyanates of Molybdenum
      Molybdenum Monosilicide
      Molybdenum Sesquisilicide
      Molybdenum Disilicide
      Molybdosilicic Acid and Molybdosilicates
      12-Molybdosilicic Acid
    PDB 1aa6-1qh8
    PDB 1r27-2jir
    PDB 2min-3unc
    PDB 3uni-4f6t

Ammonium Octamolybdate, (NH4)2Mo8O25.16H2O

Ammonium Octamolybdate, (NH4)2Mo8O25.16H2O, has been described, but may be regarded as ammonium trihydrogen tetra-molybdate, NH4O.(OH)2MoO(O.MoO2)3.OH.5H2O. This, if left in a vacuum over sulphuric acid, loses 5H2O, and a further molecule of water when heated to 160° C. Its aqueous solution at 40° C. yields crystalline needles of the trihydrogen pentamolybdate NH4O.(OH)2MoO(O.MoO2)4.OH. Hexa-, hepta-, nona- undeca-, dodeca-, and trideca-molybdates have also been prepared.

The compound NH3.MoO2.(MoO3)2.5H2O is described as an unstable brown crystalline substance obtained on mixing an aqueous solution of ordinary ammonium molybdate with a solution of molybdenum dioxide in hydrochloric acid.

The double salts NaNH4Mo3O10.H2O, 2Na2O.7(NH4)2O.21MoO3.15H2O, and 3Na2O.7(NH4)2O.25MoO3.30H2O have been described.


Three compounds have been described: NH4IO3.MoO3.H2O; (I2O5.2MoO3)4.3(NH4)2O.6H2O; I2O5.2MoO3.(NH4)2O.H2O; as well as the periodo molybdates, (NH4)5IO6.6MoO3.6H2O and (NH4)HIO6.4MoO3.

Complex molybdates of ammonium, of the types (NH4)3H6[R•••(MoO4)6]7H2O, where R••• is Fe, Cr, or Al, and (NH4)3H7[R••(MoO4)6].xH2O, where R•• is Co, Mn, or Mg, have been prepared, as also have ammonium rare-earth-molybdates and a nicotine ammonium molybdate. The existence has been recorded of double salts of the following formulae: (NH4)2Cu(MoO4)2.2NH3; CuMoO4.2NH3.H2O; (NH4)2Cd(MoO4)2.2NH3; (NH4)2Ni(MoO4)2.2NH3; (NH4)2Co(MoO4)2. 2NH3; and 3(NH4)2MoO4.CO2(MoO4)3.4MoO3.10H2O.
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