Potassium bifluoride
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Template:Chembox image cellTemplate:Chembox image cellTemplate:Chembox AllOtherNamesTemplate:Chembox headerbarTemplate:Chembox IndexlistTemplate:Chembox JmolTemplate:Chembox ChEMBLTemplate:Chembox ECHATemplate:Chembox E numberTemplate:Chembox IUPHAR ligandTemplate:Chembox UNIITemplate:Chembox CompToxTemplate:Chembox headerbarTemplate:Chembox SolubilityInWaterTemplate:Chembox headerbarTemplate:Chembox headerbarTemplate:Chembox HazardsTemplate:Chembox headerbarTemplate:Chembox Datapage checkTemplate:Yesno| Template:Longitem | Template:Unbulleted list |
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| UN number | 1811 |
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| Template:Longitem | Template:Chem2 |
| Molar mass | 78.103 g/mol |
| Appearance | colourless solid |
| Odor | slightly acidic |
| Density | 2.37 g/cm3 |
| Melting point | Template:Chembox CalcTemperatures |
| Boiling point | Template:Chembox CalcTemperatures |
| Solubility | soluble in ethanol |
| Template:Longitem | monoclinic |
| Template:Longitem | 45.56 J/(mol·K) [1] |
| Template:Longitem | −417.26 kJ/(mol·K) |
| Template:Longitem | Potassium fluoride |
| Template:Longitem | Sodium bifluoride, ammonium bifluoride |
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Potassium bifluoride is the inorganic compound with the formula Template:Chem2. This colourless salt consists of the potassium cation (Template:Chem2) and the bifluoride anion (Template:Chem2). The salt is used as an etchant for glass. Sodium bifluoride is related and is also of commercial use as an etchant as well as in cleaning products.[2]
Synthesis and reactions
The salt was prepared by Edmond Frémy by treating potassium carbonate or potassium hydroxide with hydrofluoric acid:
With one more equivalent of HF, Template:Chem2 (CAS RN 12178-06-2, m.p. 71.7 °C[3]) is produced:
Thermal decomposition of Template:Chem2 gives hydrogen fluoride:
Applications
The industrial production of fluorine entails the electrolysis of molten Template:Chem2 and Template:Chem2.[2] The electrolysis of Template:Chem2 was first used by Henri Moissan in 1886.
See also
References
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- ↑ a b Template:Ullmann
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