Potassium formate[1]
Preferred IUPAC name
Potassium formate
3D model (JSmol)
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  • InChI=1S/CH2O2.K/c2-1-3;/h1H,(H,2,3);/q;+1/p-1 ☒N
  • InChI=1/CH2O2.K/c2-1-3;/h1H,(H,2,3);/q;+1/p-1
  • C(=O)[O-].[K+]
Molar mass 84.115 g·mol−1
Appearance Colorless deliquescent crystals
Density 1.908 g/cm3
Melting point 167.5 °C (333.5 °F; 440.6 K)
Boiling point Decomposes
32.8 g/100 mL (0 °C)
331 g/100 mL (25°C)
657 g/100 mL (80 °C)
Solubility soluble in alcohol
insoluble in ether
Basicity (pKb) 10.25
GHS labelling:
GHS07: Exclamation mark
H315, H319, H335
P261, P280, P302+P352, P305+P351+P338
Lethal dose or concentration (LD, LC):
5500 mg/kg (oral, mouse)
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 formate, HCO2K, HCOOK, or KHCO2, is the potassium salt of formic acid. This strongly hygroscopic white solid[2] is an intermediate in the formate potash process for the production of potassium.[3] Potassium formate has also been studied as a potential environmentally friendly deicing salt for use on roads.[4][5] It has also been suggested for use in a less corrosive liquid desiccant.[6] A 52% solution of potassium formate has a freezing point of −60 °C (−76 °F).[7] Potassium formate brines are sometimes used for heat transfer, despite being much more corrosive than many other liquid coolants, especially to zinc and aluminum but even to many steels,[8] though some formulations are compatible with aluminum and steels.[9]


  1. ^ Olsen, J C (editor), Van Nostrand's Chemical Annual, Chapman and Hall, London, 1934
  2. ^ "MSDS - 294454". www.sigmaaldrich.com. Retrieved 2019-03-18.
  3. ^ Concise Encyclopedia Chemistry, Mary Eagleson (1994), page 888. ISBN 978-3-11-011451-5
  4. ^ "Finnish Environment Institute > Main publications on the effect of de-icing chemicals on ground water". www.syke.fi. Retrieved 2015-11-18.
  5. ^ Pasi P. Hellstén; Jani M. Salminen; Kirsten S. Jørgensen & Taina H. Nystén (2005). "Use of potassium formate in road winter deicing can reduce groundwater deterioration". Environ. Sci. Technol. 39 (13): 5095–5100. Bibcode:2005EnST...39.5095H. doi:10.1021/es0482738. PMID 16053115.
  6. ^ "Module 71: Liquid desiccants for dehumidification in building air conditioning systems".
  7. ^ "Potassium Formate for Runway Deicing".
  8. ^ "Brines and antifreeze". Retrieved 2022-01-16.
  9. ^ "Technical information on "TYFOXIT F15-F50: Ready-to-Use, High-Performance Ultra Low Viscous Secondary Refrigerants for Applications Down to –50 °C"" (PDF). Retrieved 2022-01-16.