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Practical Test-Book of Chemistry: (English)

Practical Test-Book of Chemistry: (English)

          
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About the Book

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. 1907 Excerpt: ... fluid from which it separates into drops when allowed to cool. The alcoholic solution is neutral to litmus paper. (1) Piperin 0.001 gm. gr.) dissolves in 5 drops of sulfuric acid (Reagent 21) with a yellow color, changing immediately to a red; on being breathed upon it fades to a greenish yellow. (2) Piperin colors yellow-red when strewn upon nitric acid (Reagent 15); the acid itself colors yellow. (3) The addition of a trace of sodium nitrite (NaNOz) to its acetic-acid solution gives a red color reaction. (4) Piperin acts with bismuth subnitrate like morphin, with the difference, however, that the black color is preceded for a moment by a yellow-red color. Test for Pyridin, C5H5N. Pyridin is a colorless, very mobile fluid, permanent in the light; of a strong, persistent, empyreumatic odor, readily detected in large dilutions; a burning aromatic, not permanent, bitter taste; is highly inflammable and burns with a sooty flame; dissolves easily in water, which solution has a strongly alkaline reaction to litmus paper; miscible with alcohol, ether, liquid paraffin, benzene, chloroform, and fatty oils. (1) Hydrochloric acid (Reagent 5) gives white clouds when brought near to a solution of Pyridin. (2) Pyridin gives a brown turbidity in iodin-water (Reagent 6) which soon clears up; small brown, crystalline needles form in the fluid, by which the latter is decolorized. (3) Reagent 7 solidifies, upon the addition of Pyridin, to a crystalline magma. (4) Solution of tannin (Reagent 24) gives a heavy precipitate in a 2 per cent watery Pyridin solution. (5) Calomel blackens when agitated with Pyridin. TEST FOR PYROGALLOL Test for Pyrogallol, C6H3(OH)3. Pyrogallic Acid. Pyrogallol is a bulky, white crystalline powder (or thin plates); odorless and having a bitter tast...


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Product Details
  • ISBN-13: 9781150281457
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 64
  • Series Title: English
  • Weight: 132 gr
  • ISBN-10: 1150281456
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 3 mm
  • Width: 189 mm


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