Download book Transactions of the Wisconsin Academy of Sciences, Arts, and Letters Volume 19, PT. 17/30/2016 Transactions of the Wisconsin Academy of Sciences, Arts, and Letters Volume 19, PT. 1. Wisconsin Academy of Arts & Sciences
--------------------------------------------------------------- Author: Wisconsin Academy of Arts & Sciences Number of Pages: 176 pages Published Date: 01 Mar 2012 Publisher: Rarebooksclub.com Publication Country: Miami Fl, United States Language: English Type: PDF ISBN: 9781130602913 File Name: Transactions.of.the.Wisconsin.Academy.of.Sciences,.Arts,.and.Letters.Volume.19,.PT..1.pdf Download Link: Transactions of the Wisconsin Academy of Sciences, Arts, and Letters Volume 19, PT. 1 --------------------------------------------------------------- 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. 1918 Excerpt: ...ten percent aqueous solution of the dioxide is treated with a slight excess of silver nitrate solution. Silver selenite precipitates as a white crystalline salt. This is washed by decantation until it is absolutely free from silver nitrate and nitric acid. If nitric acid is allowed to remain in the silver selenite, it decomposes the hydrogen sulfide used later thus contaminating the selenic acid. The silver selenite is suspended in water, and bromine added in small portions with vigorous shaking after each addition, until the red color of the solution indicates that an excess of bromine has been added. The solution is then placed on a steam bath for at least twelve hours to complete the oxidation and coagulate the precipitate. During all these operations care must be taken to exclude dust. The silver bromide is filtered off on well cleaned glass wool. The filtrate is concentrated by distilling off the bromine and water under reduced pressure. The distillation apparatus is so arranged that no corks, or rubber stoppers, come in contact with the acid. A Jena glass retort, sealed to a water jacketed condenser which in turn is connected to a suction flask and pump, serves the purpose very well. A few glass beads placed in the retort prevent bumping. The concentrated acid is drawn from the retort into a large wash bottle, care being taken to avoid drawing air through the solution. Well washed hydrogen sulfide is next passed through the acid until precipitation is complete, and the precipitate has become flocculent. The excess of hydrogen sulfide is then blown out by a stream of air from which all dust has been removed by bubbling through concentrated sulfuric acid. The hydrogen sulfide serves to remove any selenious acid which may be present, decomposing it with ... Read online Transactions of the Wisconsin Academy of Sciences, Arts, and Letters Volume 19, PT. 1 Buy Transactions of the Wisconsin Academy of Sciences, Arts, and Letters Volume 19, PT. 1 Download Transactions of the Wisconsin Academy of Sciences, Arts, and Letters Volume 19, PT. 1 ebook, pdf, djvu, epub, mobi, fb2, zip, rar, torrent Download to iPad/iPhone/iOS, B&N nook Transactions of the Wisconsin Academy of Sciences, Arts, and Letters Volume 19, PT. 1 ebook, pdf, djvu, epub, mobi, fb2, zip, rar, torrent Related entries: Adaptation to Climate Change in Southern Africa : New Boundaries for Development ebookprecision laser lift reviews
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