V. On hydrofluoric acid

Abstract A. Anhydrous Hydrofluoric Acid. The method I have adopted to obtain this com pound is the same as that employed by Fremy, viz. to heat to redness dry double fluoride o f hydrogen and potassium in a suitable platinum apparatus. As the results I have obtained differ somewhat from those described by Fremy, and as the anhydrous acid has been considered to be a gas by him and by several other able investigators, it will be necessary for me to state with a sufficient degree of minuteness the conditions of my experiments.