Items related to The Chemistry and Manufacture of Hydrogen
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. 1919 edition. Excerpt: ...metallic aluminium with mercury by hand, as advantage is taken of the fact that aluminium will reduce aqueous solutions of salts of mercury to the metallic state, in accordance with the following equation:--2AI + 3HgCl2 = aAlCI, + 3Hg. Consequently, if there is an excess of aluminium over that required by the equation, this excess will be automatically amalgamated by the metallic mercury as it is produced. In a practical application of this method by Mauricheau Baupre,1 fine aluminium filings are mixed with a small proportion of mercuric chloride (HgCl2) and potassium cyanide (KCN), which causes a slight rise in temperature and produces a coarse powder, which is quite stable if kept free from moisture. This mixture can be kept in air-and water-tight boxes until it is required, when it can be gradually added to water kept at about 70 C. A brisk evolution of hydrogen then takes place which closely approximates to the theoretical yield. Another very interesting application of this increased chemical activity of aluminium when amalgamated with mercury is incorporated in a toy which is sometimes seen on sale under the name of" Daddy Tin Whiskers ". This toy consists of an aluminium stamping of a face and a pencil, the core of which is filled with a preparation chiefly composed of a mercury salt. It is operated by rubbing the eyebrows and chin with this special pencil. Shortly afterwards white hairs of aluminium oxide (A1203) gather wherever the pencil has touched the aluminium. To operate the above process for the manufacture of hydrogen it is necessary that the aluminium should be as pure as possible and should not contain copper. The commercial light alloy known as "duralumin," which contains about 94 per cent, of...
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- PublisherTheClassics.us
- Publication date2013
- ISBN 10 1230448942
- ISBN 13 9781230448947
- BindingPaperback
- Number of pages34
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