Ammonium molybdate can refer to: Ammonium orthomolybdate, (NH4)2MoO4 Ammonium heptamolybdate, (NH4)6Mo7O24, usually encountered as the tetrahydrate Ammonium phosphomolybdate, (NH4)3PMo12O40 Ammonium tetrathiomolybdate, (NH4)2MoS4 this chemical is used for analysis of chloride in a solution See also Ammonium dimolybdate, (NH4)2Mo2O7