. Elements of chemistry ... derable quantities, beingfound combined with lime, forming the salt called fluate ofli?ne, but more commonly known under the name of Derby-shire spar. This latter substance is found crystalized, andof various colors intermixed, forming, when polished, one ofthe most beautiful productions of the mineral kingdom. Itis in common use, for vases, candlesticks, snuff-boxes, &c. 366. Process for fluoric acid.—To obtain fluoric acid, aquantity of fluate of lime is powdered, and submitted to theaction of twice its weight of strong sulphuric acid, in aretort of lead. On the a
. Elements of chemistry ... derable quantities, beingfound combined with lime, forming the salt called fluate ofli?ne, but more commonly known under the name of Derby-shire spar. This latter substance is found crystalized, andof various colors intermixed, forming, when polished, one ofthe most beautiful productions of the mineral kingdom. Itis in common use, for vases, candlesticks, snuff-boxes, &c. 366. Process for fluoric acid.—To obtain fluoric acid, aquantity of fluate of lime is powdered, and submitted to theaction of twice its weight of strong sulphuric acid, in aretort of lead. On the application of a gentle heat to In what respect does it resemble chlorine in properties ? What is theequivalent number of bromine ? Has the base of fluoric acid never beendetached from the acid itself? Is the same true of any of the other acids ?What is the base of fluoric acid called ? Is it known that any such baseexists ? What, natural substance contains fluoric acid ? How is fluoric acidobtained from haate of lime?. 198 FLUORIC ACID. the retort, the acid distils over, and must be received in algaden vessel. The retort, and receiver,Fig. 70. Fig. 70, made of sheet lead, and soldered together on theedges, and the juncture be-tween them stopped with alute of clay, will answervery well. The white fluormust be selected for this purpose, as being most pure. Itis first put into the retort, the acid poured in, and then con-nected with the receiver, which must be surrounded with amixture of common salt and snow, or powdered ice. Fluoric acid, at the temperature of 32°, or the freezingpoint, is a colorless liquid, and will retain its liquid state, ifpreserved in well stopped vessels, when the temperature is60°. But if exposed to the air when the temperature isabove 32°, it flies off in dense white fumes, which consistof the acid, and the moisture of the air with which it com-bines. No substance with which we are acquainted has so strongan affinity for water as fluoric acid. Its l
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