An Introduction to Chemical Analysis for Students of Medicine Pharmacy And Den
An Introduction to Chemical Analysis for Students of Medicine Pharmacy And Den
Elbert William Rockwood
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Weak acids, including carbonic, liberate the acid from these, but not from all cyanids. The insoluble cyanids of the heavy metals form soluble cyanids with those of the, alkalies, consequently potassium cyanid dissolves most of the former class. Use for the reactions a i-per-cent. Solution of KCN. 232. The silver ion forms a white precipitate of silver cyanid, AgCN, which is insoluble in nitric acid and but slightly so in ammonium hydroxid, but is soluble in KCN, forming KAg(CN) 2, the potassiu...m salt of the complex ion Ag(CN), '. 233. A few drops of ferrous sulphate solution with a solu- tion of a cyanid is converted by warming, after making alkaline with sodium hydroxid, into the ferrocyanid. That is, the ferrous ion unites with the cyanid ion to form the complex ferrocyanid ion. 6CN'+Fe=Fe(CN) fl "". Upon acidifying with hydrochloric acid and adding a few drops of ferric chlorid (the latter is unnecessary if the ferrous sulphate contained any ferric salt), a deep blue color ap- pears (55).
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