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Potassium Bifluoride

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  • Potassium bifluoride is the inorganic compound with the formula KHF2.
  • This colourless salt consists of the potassium cation and the bifluoride (HF2-) anion.
  • The salt is used in etchant for glass.
  • Sodium bifluoride is related and is also of commercial use as an etchant as well as in cleaning products.
  • KHF2 is very dangerous reagent.
  • The aqueous solution of KHF2 is weak acid, but if it is exposed other acid solution or basic solution, hydrogen fluoride gas is generated and the gas is very toxic.
  • It is a colourless tetragonal or cubic crystal with slightly acidic smell and relative density of 2.37, mp 225°C.
  • It is easy soluble in water, insoluble inalcohol.
  • Itsaqueous solution is acidity.
  • It is stable in dry air, but decomposes to release hydrogen fluoride in humid air.
  • It gives of HF when heated to 310°C, and the steam pressure of hydrogen fluoride could reach 0.10325Mpa(l atm) at 400°C 
  • The activity of fused potassium bifluoride is greater than potassium fluoride
  • It is toxic and caustic.
  • The salt was prepared by Edmond Frémy who decomposed it to generate, for the first time, hydrogen fluoride.
  • Potassium bifluoride is prepared by treating potassium carbonate or potassium hydroxide with hydrofluoric acid.
  • Potassium Bifluoride is a water insoluble Potassium source for use in oxygen-sensitive applications, such as metal production.
  • In extremely low concentrations (ppm), fluoride compounds are used in health applications.
  • Fluoride compounds also have significant uses in synthetic organic chemistry.
  • They are commonly also used to alloy metal and for optical deposition. Certain fluoride compounds can be produced at nanoscale and in ultra high purity forms.
  • Potassium Bifluoride is generally immediately available in most volumes. Ultra high purity and high purity compositions improve both optical quality and usefulness as scientific standards.
  • Nanoscale (See also nanotechnology information and quantum dots) elemental powders and suspensions, as alternative high surface area forms, may be considered.
  • A compound in the form of a white powder or colorless crystals, used in baking powder and as an antacid medicine.
  • It is easy soluble in water, insoluble in alcohol. Its aqueous solution is acidity. It is stable in dry air, but decomposes to release hydrogen fluoride in humid air. It gives of HF when heated to 310, and the steam pressure of hydrogen fluoride could reach 0.10325Mpa(l atm) at 400. The activity of fused potassium bifluoride is greater than potassium fluoride.
  • It is used to produce anhydrous Hydrofluoric Acid, pure Anhydrous Potassium Fluoride, optical glass and element fluorine, is also used for glass etching agent, the welding flux, wood preservative, etc
     

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