Potassium heptafluorotantalate

Potassium heptafluorotantalate
Names
	IUPAC name Dipotassium heptafluorotantalate
	Systematic IUPAC name Dipotassium heptafluorotantalum(2-)
	Other names Potassium heptafluorotantalate(V); Potassium fluorotantalate
Identifiers
CAS Number	16924-00-8 ;
3D model (JSmol)	Interactive image;
ChemSpider	28541740 ;
ECHA InfoCard	100.037.245
EC Number	240-986-1;
PubChem CID	28146;
CompTox Dashboard (EPA)	DTXSID00884943 ;
	InChI InChI=1S/7FH.2K.Ta/h71H;;;/q;;;;;;;2+1;+5/p-7;
	SMILES F[Ta-2](F)(F)(F)(F)(F)F.[K+].[K+];
Properties
Chemical formula	K2[TaF7]
Molar mass	392.13 g/mol
Appearance	white solid
Density	4.56 g/mL at 25 °C
Melting point	630 to 820 °C (1,166 to 1,508 °F; 903 to 1,093 K)
Solubility in water	0.5 g/100 mL (15 °C) Nb2O5 + 4 KHF2 + 6 HF → 2K2NbF7 + 5 H2O.
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H315, H319, H331, H335
Precautionary statements	P261, P264, P270, P271, P280, P301+P310, P302+P352, P304+P340, P305+P351+P338, P311, P312, P321, P330, P332+P313, P337+P313, P362, P403+P233, P405, P501
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	110 mg/kg (Oral: rat)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Potassium heptafluorotantalate is an inorganic compound with the formula K₂[TaF₇]. It is the potassium salt of the heptafluorotantalate anion [TaF₇]²⁻. This white, water-soluble solid is an intermediate in the purification of tantalum from its ores and is the precursor to the metal.