The Chemical News Volume 1-2 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1860 Excerpt: ...KCy + zI = KI.CyI These crystals of the iodocyanide of potassium are easily decomposed; indeed they cannot he purified without to some extent modifying their constitution. The bodies-which compose them do not completely lose the properties they possessed in the free state. For instance, the iodide of potassium is more easily soluble in water than iodide of cyanogen, so by continuing its action the first of the iodides is completely removed. With ether the reverse takes place; the iodide of cyanogen is removed, and the iodide of potassium is left. By prolonged exposure to atmospheric air the needles lose the iodide of cyanogen, and are changed into cubic crystals. The original crystals are soluble in water, alcohol, and ether, but the last liquid produces some change, and furnishes on spontaneous evaporation new crystals, which contain a larger proportion of iodide of cyanogen. The properties of the crystals recall at once those of the iodides of cyanogen and potassium. Their solution with sulphurous acid blues starch; it gives a yellowish white precipitate with nitrate of silver, yellow with the salts of lead, and red with bichloride of mercury. Ammoniacal nitrate df silver gives a black precipitate the nature of which the author has not yet determined. The analysis of the crystals gave: --Jew i.nmiT of Aldehyde.--When glycol is acted on by chloride of zinc at a high temperature, aldehyde and several other ethereal and oleaginous bodies arc produced. Among them is one with a remarkably sharp acrid taste. Wurtz separated and analysed a small quantity of this liquid, and came to the conclusion that it was a body isomeric with aldehyde. M. Bauer has followed up the researches of Wurtz.3 lie found that the aqueous liquid produced by the action of chloride of zin..