Thallous Paramolybdate, 5Tl₂O.12MoO₃

Thallous Paramolybdate, 5Tl₂O.12MoO₃, is obtained as a yellow microcrystalline precipitate when excess of hot thallous sulphate solution is added to a hot solution of sodium paramolybdate. The salt is slightly soluble in water, readily soluble in mineral acids and in alkalies. On heating it deepens in colour, and melts at red heat to a dark brown liquid. Thallous paramolybdate is interesting in that it is unusual to obtain paramolybdates in the anhydrous condition.