Lithium Tetramolybdate, Li₂O.4MoO₃.7H₂O

Lithium Tetramolybdate, Li₂O.4MoO₃.7H₂O, is obtained, by boiling lithium carbonate with a large excess of molybdic acid, as a yellow amorphous mass which gradually becomes hard and brittle. Tetramolybdates, of composition Li₂O.3H₂O.16MoO₃.6½H₂O and Li₂O.H₂O.8MoO₃.10H₂O, have been obtained by the action of hydrochloric acid on the normal molybdate. The former yields triclinic crystals, and from its solution a trimolybdate containing 2 or 4H₂O has been obtained.

A iodomolybdate of lithium, 2I₂O₅.4MoO₃.2Li₂O.5H₂O, and periodo- molybdates, Li₅IO₆.6MoO₃.15H₂O and Li₅IO₆.6MoO₃.9H₂O, have been prepared, as well as phospho- and arsenio-molybdates.