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Silver fluoride, AgF

Evaporation in vacuum of a solution of silver oxide in hydrofluoric acid yields the Silver fluoride, AgF, in the form of an amorphous, yellow mass, of density 5.852 at 15.5° C. At red heat it melts to a black liquid, which on cooling solidifies to a crystalline mass. It is very soluble in water, its solubility at 15.5° C. being 181.8 grams per 100 grams of water. The solution has a neutral reaction. In its solubility the fluoride presents a marked contrast to the other silver halides. The anhydrous salt can absorb 844 times its volume of ammonia.

Two hydrates have been described. The monohydrate, AgF,H2O, forms yellowish cubes,4 or large, deliquescent, tetragonal crystals, decomposed by heat with formation of a basic salt, Ag2F(OH), and evolution of hydrogen fluoride. The dihydrate, AgF,2H2O, crystallizes from concentrated solution in hard, transparent prisms.

From a solution of the fluoride in dilute hydrofluoric acid there crystallizes an acid salt, AgF,HF, in brown, deliquescent crystals. On cooling, a solution of the fluoride in pure hydrogen fluoride deposits white crystals of the formula AgF,3HF.

An aqueous solution containing 0.0002 per cent, of silver fluoride has been employed as a sterilizer to render water potable. The salt is sensitive to light.

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