A manual of chemistry : containing a condensed view of the present state of the science, with copious references to more extensive treatises, original papers, &c: intended as a text-book for medical schools, colleges, and academies . f potassium is generated. Onthe other hand, the affinity of cyanogen for the metallic oxides is com-paratively feeble. Hence it can have no claim to the character of anacid. Preparation. Cyanogen does not exist in nature, butpared by the decomposition of the cyanide of mercury,which will be described hereafter. This substance, well dried, at a temperaturebelow tha
A manual of chemistry : containing a condensed view of the present state of the science, with copious references to more extensive treatises, original papers, &c: intended as a text-book for medical schools, colleges, and academies . f potassium is generated. Onthe other hand, the affinity of cyanogen for the metallic oxides is com-paratively feeble. Hence it can have no claim to the character of anacid. Preparation. Cyanogen does not exist in nature, butpared by the decomposition of the cyanide of mercury,which will be described hereafter. This substance, well dried, at a temperaturebelow that of boiling water, is put into a smallglass retort, or a common test tube, to the openend of which a cork is accurately this is passed a smaller pipe, whichmay be straight or bent at right angles. Thecyanide of mercury is put into the tube, the openend of which is closed by the cork. Heat is nowapplied ; the cyanide first blackens, then liqui-fies, and the cyanogen comes over in the formof gas, which may be collected over mercury;or its combustibility and the peculiar colour ofits flame may be exhibited by bringing a taperinto contact with the gas as it issues from theorifice of the pipe. may be pre-a compound. * From the Greek kuanos, blue, and gennao, I generate; because it is an es-tential ingredient of Prussian blue. 190 CARBON. CYANOGEN AND Acid, of Wohler.—Atom. Num. 34r—Symb. (N-|-2C)-{-0. This acid has a penetrating odour similar to the strongest aceticacid ; it is very pungent, irritating the eyes strongly, and causing painwhen applied to the skin ; is very volatile, giving off a vapour whichis inflammable and posesses acid properties ; when combined withwater, heat is produced, and it is converted into carbonate of ammo-nia. Cyanic acid may be obtained in combination with one atom of water,by subjecting to a low red heat, in a small glass retort, the cyanuricacid to be presently noticed. The vapours which are given off arecollected in
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