An Introduction To Practical Organic Analysis; Adapted To The Requirements Of The First M.b…

Paperback | February 4, 2012

byGeorge E R. Ellis

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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. 1885. Excerpt: ... SECTI0N II. SPECIAL TESTS FOR THE ACIDS AND OTHER ORGANIC BODIES. For these tests it is best to separate from the solution any metal which it may contain (except K, Na, or Am), as the reagents used are liable to precipitate some of the metals from their solutions. 9. This is generally done by boiling the given solution with Na2C03 (solution) until no further precipitate is obtained. Filter off the precipitate,1 and to the filtrate add a very slight excess of HN03, boil to expel any C02 present, then add NaH0, drop by drop, till the solution is exactly neutral. The solution thus obtained is then used for the following tests, and is referred to as the original' Na2C03' solution. 10. Formic Acid and Formates: CH202. Acetic Acid and Acetates: C2H402. These two acids, corresponding respectively to methyl and ethyl alcohol, belong to the fatty acid series. Formic acid, found in nettles and in the bodies of red ants, is a fuming irritating liquid, boiling 1 This treatment with Na2COs may be omitted when metals of the first four groups are absent. at 105. Acetic acid, obtained from vinegar, is a colourless liquid, with a strong acid taste and smell, boiling at 117, and freezing at 17. The acetates of silver and mercury (protosalt) are only slightly soluble in water; the other acetates are readily soluble. 11. Tests.--Formic Acid. 1. Heated with strong H2S04, no charring takes place, but C0 is evolved, which, if lighted, burns with a blue flame. An oxalate reacts in the same way. 2. To a neutral solution of a formate, add C2H60, then strong H2S04; heat. Formic ether (CH I J 1s S1ven ff (fragrant smell). If an acetate be used, acetic ether will be produced, but the smells are so alike that this test cannot be relied upon to distinguish between the two salts. 3. AgN...

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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. 1885. Excerpt: ... SECTI0N II. SPECIAL TESTS FOR THE ACIDS AND OTHER ORGANIC BODIES. For these tests it is best to separate from the solution any...

Format:PaperbackDimensions:24 pages, 9.69 × 7.44 × 0.05 inPublished:February 4, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217172849

ISBN - 13:9780217172844

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