The Encyclopedia Of Chemistry Practical And Theorectical

Author : James Curtis Booth
Publisher : Rarebooksclub.com
ISBN 13 : 9781230192499
Total Pages : 840 pages
Book Rating : 4.1/5 (924 download)

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Download or read book The Encyclopedia of Chemistry, Practical and Theoretical; Embracing Its Application to the Arts, Metallurgy, Mineralogy, Geology, Medicine, and Pharma written by James Curtis Booth and published by Rarebooksclub.com. This book was released on 2013-09 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt: This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1862 edition. Excerpt: ...3 FeCy, 2 FeaCy3 4-Fe, Os. It is basic Prussian blue, or oxy-ferridcyanide of iron and Prussian blue, 3 FeCy, FejCy, -fFe2Cy?, FeaO, . After dissolving out all other salts, it becomes soluble in water, without leaving a residue, forming a deep blue and rather permanent solution, precipitable by a salt, not by alcohol, and redissolving in water for the greater part. Its formation is prevented by the presence of strong acid. There is always a portion of sesquicyanide of iron formed by oxidation in the air, which tends to form a quadruple salt with ferrocyanide of potassium; but the greater part of the latter may be removed by washing. Soluble Prussian blue. When a persalt of iron is added to an excess of ferrocvanide of potassium, and the salts are washed away from the precipitate, the latter dissolves with a deep blue color, which, on evaporation, yields nearly 2 KCy, FeCy-f-3 FeCy, 2 FeCy, or 1 eq. each of Prussian blue and ferrocyanide of potassium. It is precipitable by salts, acids, and alcohol, and hence differs from the preceding basic compound. Evaporated in the air, and treated with (86 pr. ct.) alcohol, the blue compound, still soluble in water, is 2 (2 KCy, FeCy)+3 (3 FeCy, 2 Fe8Cys). The insoluble part remaining in Prussian blue, prepared with an excess of iron persalt, is 2 KCy, FeCy +2(3 FeCy, 2 FeCy, ). We have thus 3 compounds containing 2, 3, and 4 eq. Prussian blue respectively to 2 eq. ferrocyanide of potassium. When a neutral solution of pernitrate or perchloride of iron is added to yellow prussiate of potash, the iron-salt not being in excess, Berzelius's Neutral Prussian blue is precipitated with the form. 3 FeCy, 2 Fe4Cys. It may be termed biferridcyanide of iron. Another ferridcyanide of iron, prepared by precipitating...