XII. On fluoride of silver

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Abstract
Formation Anhydrous or gaseous hydrofluoric acid had no visible action on metallic silver; by electrolysis of the aqueous acid with a silver anode, the metal was dissolved and argentic fluoride formed; by electrolysis of anhydrous hydrofluoric acid also, a silver anode was rapidly corroded. Metallic silver in contact with platinum, in a mixture of dilute hydro­fluoric acid and aqueous nitrate of potassium, was not corroded even with the aid of heat. A solution of nitrate of silver, mixed with dilute hydrofluoric acid, did not yield fluoride of silver on evaporation to dryness; nor did it show any signs of decomposition on the addition of solutions of any of the soluble fluorides, except stannous fluoride, or a satu­rated solution of fluoride of potassium. The effects of anhydrous hydrofluoric acid upon oxide, peroxide, nitrate, chloride, iodide, and carbonate of silver have been already briefly described (Phil. Trans. Roy. Soc. 1869, pages 191 and 192). Preparation. I prepared the salt as follows:—A solution of pure nitrate of silver was precipitated by pure carbonate of sodium, and the well-washed carbonate dissolved in dilute hydro­fluoric acid; a little heat was absorbed. The clear liquid was heated to boiling, filtered, evaporated, and heated to incipient fusion; transferred whilst hot to a bottle of platinum, and when partly cool retransferred to a gutta-percha bottle.

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