Experimental Chemistry For Junior Students Volume 4; Chemistry Of Carbon Compounds, Or Organic…

Paperback | May 19, 2012

byJames Emerson Reynolds

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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. 1887 Excerpt: ...cooling it solidifies to a pearly crystalline mass. When heated with excess of am o 2 monia1 it is converted into urea and ethyl alcohol: hence its name urethane--/NH2 /NH2 CO +NH3=CO + HOC2H5 X)C2H5 XNH2 Urethane. Urea. Carbamide, or urea, is, however, most easily prepared from human urine, of which it forms one to two per cent. Experiment 740.--Evaporate half a liter of fresh urine to about one-fifth of its original volume, and allow it to cool. Pour the concentrated urine into a rather tall beaker, and cool the latter by resting it in a freezing mixture of hydrochloric acid and crystallised sodium sulphate. Similarly cool an equal volume of colourless nitric acid, then pour the latter into the urine and mix quickly. Some effervescence, due to the decomposition of a little ammonium carbonate, generally takes place, and then brownish crystals of urea nitrate, CON2H4,HN03, separate, as the latter is very slightly soluble in free nitric acid, though easily dissolved by pure water. The semi-solid mass is thrown on a funnel whose neck is partially closed by fibrous asbestos, and the acid liquid is drained away. The residue is then washed with a little icecold water, removed, and air-dried on porous bricks. When quite dry the nitrate will keep indefinitely. 1 If cyanic acid (which may be regarded as the imide of carbonic acid, CO = NH) be allowed to act on urethane, ethyl allophanate is produced, Coqq s Synthesis of Urea. 197 In order to separate urea from the nitrate mix the latter with a little warm water, and add barium carbonate until effervescence no longer takes place on further addition. Evaporate the whole on the waterbath to dryness, and digest the residue with alcohol, adding at the same time a little freshly ignited animal charcoal to absorb some bro...

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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. 1887 Excerpt: ...cooling it solidifies to a pearly crystalline mass. When heated with excess of am o 2 monia1 it is converted into urea and ethyl...

Format:PaperbackDimensions:90 pages, 9.69 × 7.44 × 0.19 inPublished:May 19, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217716156

ISBN - 13:9780217716154

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