Barium Permolybdate, Ba(MoO₄)₂.2H₂O

Barium Permolybdate, Ba(MoO₄)₂.2H₂O, is precipitated in the form of yellow, microscopic, octahedral crystals by the action of ammonium permolybdate on barium chloride, or of hydrogen peroxide on barium dimolybdate at 80° C. No precipitate is obtained in the cold. When heated the crystals become white, and water and oxygen are given off leaving a residue of barium dimolybdate.

A complex compound with oxalic acid has been described.