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Thorium Fluoride, ThF4

Anhydrous thorium fluoride, ThF4, is obtained as a white, amorphous powder by passing hydrogen fluoride over the chloride or bromide, heated to 350°-400° C.

The hydrated fluoride ThF4.4H2O is formed as a gelatinous precipitate, passing into a heavy white powder, when hydrofluoric acid is added to a solution of a thorium salt. Unlike zirconium fluoride, thorium fluoride is insoluble in hydrofluoric acid; this difference furnishes a means for the quantitative separation of the two metals. When strongly ignited in air.the fluoride leaves a residue of thoria.
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