Rubidium Trimolybdate, Rb₂Mo₃O₁₀.2H₂O

Rubidium Trimolybdate, Rb₂Mo₃O₁₀.2H₂O or 3H₂O, is prepared by fusing rubidium carbonate with excess of molybdenum trioxide and extracting with boiling water. Brilliant hexagonal crystals, soluble in water, are deposited. A hydrate, of the approximate composition Rb₂O.3MoO₃.6½H₂O, is a product of the decomposition of the paramolybdate by hot water.