Back بيفلوريد البوتاسيوم Arabic پوتاسیوم بی‌فلوئورید AZB Hydrogendifluorid draselný Czech Kaliumhydrogendifluorid German Kalia bifluorido Esperanto Bifluoruro de potasio Spanish پتاسیم بی‌فلوئورید Persian Kaliumvetyfluoridi Finnish Bifluorure de potassium French पोटासियम बाइफ्लोराइड Hindi

Potassium bifluoride

Potassium bifluoride
Names
IUPAC name
Potassium bifluoride
Other names
Potassium hydrogen difluoride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.233 Edit this at Wikidata
EC Number
  • 232-156-2
RTECS number
  • TS6650000
UNII
UN number 1811
  • InChI=1S/F2H.K/c1-3-2;/q-1;+1 ☒N
    Key: FLCWRBFUWAZYGV-UHFFFAOYSA-N ☒N
  • [H-](F)F.[K+]
Properties
K[HF2]
Molar mass 78.103 g/mol
Appearance colourless solid
Odor slightly acidic
Density 2.37 g/cm3
Melting point 238.7 °C (461.7 °F; 511.8 K)
Boiling point decomposes
  • 24.5 g/(100 mL) (0 °C)
  • 30.1 g/(100 mL) (10 °C)
  • 39.2 g/(100 mL) (20 °C)
  • 114.0 g/(100 mL) (80 °C)
Solubility soluble in ethanol
Structure
monoclinic
Thermochemistry
45.56 J/(mol·K) [1]
-417.26 kJ/(mol·K)
Hazards
GHS labelling:[2]
GHS05: CorrosiveGHS06: Toxic
Danger
H301, H310, H314
P260, P262, P264, P270, P280, P301+P310, P301+P330+P331, P302+P350, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P322, P330, P361, P363, P405, P501
Flash point non flammable
Related compounds
Other anions
 Potassium fluoride
Other cations
 Sodium bifluoride, ammonium bifluoride
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 bifluoride is the inorganic compound with the formula K[HF2]. This colourless salt consists of the potassium cation (K+) and the bifluoride anion ([HF2]−). 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.[3]

  1. ^ Westrum, Edgar F. Jr.; Pitzer, Kenneth S. (June 1949). "Thermodynamics of the System KHF2-KF-HF, Including Heat Capacities and Entropies of KHF2, and KF. The Nature of the Hydrogen Bond in KHF2". J. Am. Chem. Soc. 71 (6): 1940–1949. doi:10.1021/ja01174a012.
  2. ^ "Potassium bifluoride". pubchem.ncbi.nlm.nih.gov. Retrieved 27 December 2021.
  3. ^ Aigueperse, Jean; Mollard, Paul; Devilliers, Didier; Chemla, Marius; Faron, Robert; Romano, René; Cuer, Jean Pierre (2000). "Fluorine Compounds, Inorganic". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a11_307. ISBN 3527306730.
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