A Revision Of The Atomic Weight Of Antimony

Author : Roy Kenneth McAlpine
Publisher :
ISBN 13 : 9781332240449
Total Pages : 34 pages
Book Rating : 4.2/5 (44 download)

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Download or read book A Revision of the Atomic Weight of Antimony the Analysis of Antimony Bromide written by Roy Kenneth McAlpine and published by . This book was released on 2015-08-05 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from A Revision of the Atomic Weight of Antimony the Analysis of Antimony Bromide: A Dissertation Submitted in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy in the University of Michigan It requires only a cursory glance at the earlier reports of the International Committee on Atomic Weights to learn that the value in the tables to-day for the atomic weight of antimony rests on no secure basis. It was put forth in 1903 as a compromise between Cooke's work on the bromide, pointing to 120.0, and the work of Cooke and of Schneider on the sulfide and the work of Friend and Smith on tartar emetic, the three latter giving values ranging from 120.22 to 120.55. Careful examination of the papers dealing directly with the analytical problem shows that the uncertainty is much greater actually than the above would indicate. Disregarding the work of Berzelius, from which he selected the number 129, as well as the earlier work of Kessler, which he himself later corrected for known errors, the other determinations group themselves into two main divisions approximating 120 and 122. Thus Dexter (1857), Dumas (1859), and Kessler (1860), obtained 122.46, 121.83 and 122.08-122.33, respectively, on the basis of which the number 122 was generally adopted. Schneider (1856), however, had analyzed a native sulfide of antimony, the data pointing to the number 120.55, and Cooke (1877 - 81) made a laborious study including syntheses of antimony trisulfide and the estimation of halogen in the tri-halides of antimony, which was so convincing that it immediately established the lower value, 120. Cooke's last data on the ratios, SbBr: 3Ag and SbBr: 3AgBr, presented a concordance of results unknown to chemical analysis of that day, and are credited by Brauner with introducing the modem era of atomic weight determinations. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.