Ammonium Dimolybdate, (NH₄)₂Mo₂O₇.H₂O

Ammonium Dimolybdate, (NH₄)₂Mo₂O₇.H₂O, exists as monoclinic (prismatic) crystals. A compound (NH₄)₂Mo₂O₇.3NH₃ has been prepared by addition of ammonium hydroxide of medium strength to solid ammonium phosphomolybdate. This substance loses ammonia, yielding the dimolybdate.