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Potassium Octamolybdate, K2Mo8O25.13H2O

Potassium Octamolybdate, Potassium Hydrogen Tetramolybdate, K2Mo8O25.13H2O or K3H7[H2(Mo2O7)6]15H2O, has been prepared by allowing to crystallise a solution of trimolybdate to which molybdic anhydride has been added until a precipitate begins to form; by double decomposition of hot solutions of ammonium tetramolybdate and potassium sulphate; or by saturating a solution of the tetramolybdate with sulphur dioxide. The salt is decomposed by water.
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