Author: William Crookes

Publisher: Forgotten Books

Published: 2018-03

Total Pages: 656

ISBN-13: 9780666682024

Excerpt from The Chemical News and Journal of Physical Science, 1900, Vol. 81: With Which Is Incorporated the "Chemical Gazette"; A Journal of Practical Chemistry in All Its Applications to Pharmacy, Arts, and Manufactures In the Usina Wigg ore, which has an average of about 55 per cent of metallic manganese, grm. Of the ore is ample for its proper estimation. The acid solution is electrolysed hot, and the manganese dioxide which is deposited at the positive pole is con verted by ignition to Mn3o4, which gives results varying only in the fourth decimal place. The solution made strongly acid with nitric acid is contained in a previously weighed platinum dish, and a spiral of platinum wire is brought into contact with the surface of the liquid. The dish and spiral are connected to a Bunsen cell, the dish to the positive pole and the spiral to the negative pole. The dish is placed on a water-bath, and as soon as the current is started heat is applied to the water-bath and the temperature kept as near 60° C. As possible. It is necessary to have the solution very acid to start with, and as during the operation it is turned into ammonia, a few drops of acid must occasionally be added to it. Great care is necessary to watch that the solution is always acid. 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.