Potassium heptafluorotantalate

Potassium heptafluorotantalate
Names
IUPAC name
Dipotassium heptafluorotantalate
Systematic IUPAC name
Dipotassium heptafluorotantalum(2-)
Other names
Potassium heptafluorotantalate(V)
Potassium fluorotantalate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.037.245 Edit this at Wikidata
EC Number
  • 240-986-1
  • InChI=1S/7FH.2K.Ta/h7*1H;;;/q;;;;;;;2*+1;+5/p-7
  • F[Ta-2](F)(F)(F)(F)(F)F.[K+].[K+]
Properties
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)
0.5 g/100 mL (15 °C)[1]
Nb2O5 + 4 KHF2 + 6 HF → 2K2NbF7 + 5 H2O.</ref>
Hazards
GHS labelling:
GHS06: ToxicGHS07: Exclamation mark
Danger
H301, H315, H319, H331, H335
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):
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).
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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.[2]

  1. ^ W. Kwasnik (1963). "Potassium Heptafluorotantalate (V)". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 2pages=256. NY, NY: Academic Press.
  2. ^ Cite error: The named reference Agulyanski was invoked but never defined (see the help page).