HF has a pKa value of 3.17, which indicates that it is a weak acid. It is the chemical symbol for hydrogen fluoride, which, when added to an aqueous solution, becomes hydrofluoric acid.
The acidity of a compound is described by the acid dissociation constant, written as Ka. The acid dissociation constant shows how much the acid ionizes when placed in a diluted solution. The stronger the acid, the higher the pKa, meaning that the acid ionizes more. When added to water, HF dissociates to form the fluorine ion and H3O. Hydrogen fluoride has a molar mass of about 20.01 grams per mole. HF is dangerous in both its gas and solution forms.