Complex Strontium Molybdates

By boiling a mixture of strontium nitrate and molybdoiodic acid, and then cooling, a white spongy mass of small crystals of composition 3SrO(I₂O₅.2MoO₃)₄.15H₂O is produced. The normal molybdoiodate may be prepared by the action of the lithium salt on strontium nitrate. It is very soluble in water, and on evaporating a solution of the salt, the compound SrO.I₂O₅.2MoO₃.3H₂O is obtained. There is also a sulphomolybdate.

A double strontium sodium molybdoperiodate, of composition 4SrO.Na₂O.I₂O₇.12MoO₃.20H₂O, has been described, and an arseno-molybdate.