Definition of potassium fluoride
: any of several salts made usually by reaction of hydrofluoric acid with potassium carbonate: such as a : the hygroscopic crystalline normal salt KF used chiefly as a solder flux and as a fluorinating agent in organic synthesis b or potassium bifluoride : the poisonous corrosive crystalline acid fluoride KHF2 used chiefly as an electrolyte in the manufacture of fluorine and as a solder flux : potassium hydrogen fluoride
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