Potassium hexafluoroarsenate is an inorganic chemical compound with the chemical formula KAsF6.[2][3]
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| Names | |
|---|---|
| IUPAC name potassium hexafluoro-λ⁵-arsanuide | |
| Identifiers | |
3D model (JSmol) | |
| ChEBI | |
| ChemSpider | |
| ECHA InfoCard | 100.037.351 |
| EC Number |
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| KEGG | |
PubChem CID | |
| UNII | |
CompTox Dashboard (EPA) | |
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| Properties | |
| AsF6K | |
| Molar mass | 228.0103 g·mol−1 |
| Appearance | white powder |
| Melting point | 400 °C (752 °F; 673 K) |
| Hazards | |
| GHS labelling:[1] | |
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| 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). | |
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[H3O]
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]