Non-Fiction Books:

Proceedings of the American Academy of Arts and Sciences, Vol. 13

From May, 1877, to May, 1878; Selected from the Records (Classic Reprint)

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Proceedings of the American Academy of Arts and Sciences, Vol. 13 by American Academy of Arts and Sciences
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Excerpt from Proceedings of the American Academy of Arts and Sciences, Vol. 13: From May, 1877, to May, 1878; Selected From the Records In June, 1861, F. Kessler, of Dantzic, published in Poggendorfis Annalen a paper devoted to a re - examination of the atomic weights of chromium, arsenic, and antimony, based on a method of volumetric analysis which he had previously described in the same journal.t Indeed, in his earlier paper he had already quite fully elaborated the subject, and thus anticipated both Schneider and Dexter in correcting the old number of Berzelius. The method of Kessler was based on the reciprocal relations of potassic dichromate and ferrous chloride; and, as is well known, standard solutions of these salts are especially well adapted to volumetric determinations, by the circumstance that the neutral point can be so accurately fixed by the reaction with potassic ferricyanide. For the details of the method, which were quite numerous and complicated, we must refer to the original paper. It is sufficient for the present purpose to say that the atomic weight of anti mony was thus indirectly referred to the molecular weight of potassic chlorate, which was taken as according to the determinations of Pelouze and of Marignac. Kessler experimented with antimony, with antimonious oxide, and antimonious chloride, and obtained results vary ing between and We translate his own commentary: Although the results of these experiments, taken as a whole, agree very nearly with those obtained by Dexter, I must nevertheless confess that I am not wholly convinced that our number, which is two hydrogen units higher than that found by Schneider, is much nearer the truth than his. Every one who has occupied himself with the analysis of different antimony compounds must be able to indorse what Berzelius wrote in 1812: 'i have never worked with a material with which it was so extremely difficult to obtain constant results' Neverthe less, I believe I have been able to Show that in the analysis of anti mony compounds the volumetric method is capable of affording a very sharp control over results Obtained in other ways. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at 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.
Release date Australia
November 19th, 2016
Country of Publication
United States
, black & white illustrations
Forgotten Books
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