Potassium heptafluorotantalate

Potassium heptafluorotantalate is an inorganic compound with the formula K₂[TaF₇]. It is the potassium salt of the heptafluorotantalate anion [TaF₇]. This white, water-soluble solid is an intermediate in the purification of tantalum from its ores and is the precursor to the metal.