Assaying (volume 2-3); In Three Parts

Paperback | January 12, 2012

byCharles Howard Aaron

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This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1906. Not illustrated. Excerpt: ... HUMID ASSAYS OF SILVER BULLION. Ow1ng to the uncertainty attending the fire assay of silver bullion, the humid method of Gay Lussac is used in all United States mints and first-class private offices. This method depends on the fact that silver in nitric acid solution is completely precipitated in the form of chloride by a solution of common salt. At the same time the salt is decomposed, so that, if suitable proportions of silver and salt be thus brought together, neither can afterward be found in the liquid. In the Royal Mint of India, the precipitated silver chloride is dried and weighed, and from its weight that of the pure silver is calculated. In this country and in Europe the quantity of silver in the solution is estimated by the quantity of salt solution of known strength requisite for its precipitation. The salt solution is either weighed or measured; the latter method is the most general, and is called-- Gay Lussac's Method.--A solution of salt in water is made, of which 100 cubic centimeters will exactly precipitate 1,000 of pure silver, leaving neither salt nor silver in the liquid. This is the normal solution. The thousand used in this assay is either 10 grains or 1 gramme, the latter generally. Another solution of salt is made onetenth as strong as the normal; consequently 1 cubic centimeter of it precipitates one point of silver. This is the decime salt solution. A decime solution of silver is also prepared, of which I cubic centimeter contains one point of silver; consequently the two decime solutions are equivalent, volume for volume, each neutralizing the other. The sign for a cubic centimeter is c. c. Measur1ng The Normal Solut1on. --A glass pipette containing 100 c. c. is used. The accompanying diagram and directions are from Mitchell: Immerse ...

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This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1906. Not illustrated. Excerpt: ... HUMID ASSAYS OF SILVER BULLION. Ow1ng to the uncertainty attending the fire assay of silver bullion, the humid method of Gay Lussac i...

Format:PaperbackDimensions:38 pages, 9.69 × 7.44 × 0.08 inPublished:January 12, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217176933

ISBN - 13:9780217176934

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