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.