Potassium hexafluoroarsenate
Names
IUPAC name
potassium hexafluoro-λ⁵-arsanuide
Identifiers
ChEBI
ChemSpider
ECHA InfoCard
100.037.351
EC Number
KEGG
UNII
InChI=1S/AsF6.K/c2-1(3,4,5,6)7;/q-1;+1
Key: DITNVAZRXJOPSJ-UHFFFAOYSA-N
Properties
As F 6 K
Molar mass
228.0103 g·mol−1
Appearance
white powder
Melting point
400 °C (752 °F; 673 K)
Hazards
GHS labelling :[ 1]
Danger
H301 , H331 , H410
P261 , P264 , P270 , P271 , P273 , P301+P316 , P304+P340 , P316 , P321 , P330 , P391 , P403+P233 , P405 , P501
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
Chemical compound
Potassium hexafluoroarsenate is an inorganic chemical compound with the chemical formula KAsF6 .[ 2] [ 3]
Synthesis
Potassium hexafluoroarsenate can be prepared by direct action of arsenic pentafluoride and potassium fluoride :
AsF5 + KF → KAsF6
Also, it can be synthesized by the action of hydrofluoric acid on arsenic pentafluoride in the presence of potassium perbromate :[ 4]
KBrO4 + 3HF + 2AsF5 + KF → KAsF6 + AsF6 [H3 O]
Also, potassium hexafluoroarsenate is synthesized by treating arsenic pentachloride and potassium chloride in the presence of hydrofluoric acid :
AsCl5 + KCl + 6HF → KAsF6 + 6HCl
Physical characteristics
Potassium hexafluoroarsenate is a white powder with a pungent odor. The compound is stable under normal conditions. The melting point is around 400 °C. The substance is not flammable. It is incompatible with strong oxidizing agents.[ 5]
Safety
Potassium hexafluoroarsenate is toxic when swallowed or inhaled and is hazardous to the environment. The compound is considered carcinogenic. Hazards in the event of fire include hydrogen fluoride, potassium oxide and arsenic oxides.[ 6]
References
H, (pseudo)halogens chalcogens pnictogens B, C group transition metals organic
PF6 − , AsF6 − , SbF6 − compounds AlF6 − compounds chlorides, bromides, iodides and pseudohalogenides SiF6 2- , GeF6 2- compounds Oxyfluorides Organofluorides with transition metal, lanthanide, actinide, ammonium nitric acids bifluorides thionyl, phosphoryl, and iodosyl