The Repudiation Of State Debts; A Study In The Financial History Of Mississippi, Florida, Alabama…

Paperback | July 9, 2012

byWilliam Amasa Scott

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1893 edition. Excerpt: ... new filter. Test the precipitate no further; but examine the filtrate for Mg and alkali metals as described below. Notes.--i. The nitrate from the (NH4)2S precipitate should be colorless or light yellow. (See note 3, page 3i.) If it has become turbid through separation of sulphur from standing in the air, or if it becomes so on warming, acidify the solution with HCl, boil for five or ten minutes, and filter; then add NH4OH and (NH4)oCO3. The (NH4)2S is thus destroyed, and the boiling prevents the sulphur from passing through the filter. 2. Ammonium salts considerably increase the solubility of the alkaline-earth carbonates in water, so that small quantities of the. metals might escape detection if (NH4)2CO3 were alone employed; hence the further tests with (NH4)2SO4, and (NH1).,C2O4 for Ba and Ca respectively. Even if already detected in the (NH4)2CO3 precipitate, the traces of these. metals must be so removed, as otherwise they will precipitate in the test for Mg. 3. The presence of ammonium salts is necessary, however, in order to avoid the precipitation of MgCO3(NH4)2CO3. For the same reason the solution should be moderately dilute and hot stand long before filtering. Procedure.--Dissolve the precipitated carbonates in a small quantity of dilute HNO3. Evaporate the solution to dryness in a small porcelain dish, and heat quite strongly.on an iron plate until no odor of HNO3 can be detected. As soon as it is cold, rub the contents of the dish to powder by means of a pestle, add 5--10 cc. of a mixture of equal volumes of absolute alcohol and ether, and triturate with the pestle for two or three minutes. Filter, and add two drops of dilute H2SO4 to the filtrate. Wash the residue on the filter with small quantities of the alcohol-ether mixture...

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1893 edition. Excerpt: ... new filter. Test the precipitate no further; but examine the filtrate for Mg and alkali metals as described below. Not...

Format:PaperbackDimensions:26 pages, 9.69 × 7.44 × 0.05 inPublished:July 9, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217368026

ISBN - 13:9780217368025

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