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Methods of Quantitative Organic Analysis

Methods of Quantitative Organic Analysis


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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. 1914 edition. Excerpt: ...acetaldehyde and benzaldehyde, are stated to be quantitatively precipitated by p-nitrophenylhydrazine, so that this reagent was tested as to its general applicability. The aldehyde solutions were as in the previous method, and the precipitant was freshly prepared when required by filtering a solution in either 30 per cent HA or cold dilute HCl. The acetic acid method is the most accurate known for benzaldehyde. A 1 per cent solution of benzaldehyde in 12 per cent acetic acid was prepared, and 25 c.c. of this were diluted with 50 c.c. of water and 30 c.c. of 30 per cent HA, containing about twice the calculated quantity of _p-nitrophenylhydrazine then added. The precipitate was allowed to stand five hours, filtered on a Gooch, washed with 10 per cent HA to absence of strong colour with dilute alkali, and dried at 105-110. Weight of hydrazone x 0-4400 = weight of benzaldehyde. If the amount of benzoic acid associated with the aldehyde is separately estimated and subtracted from the weight of aldehyde used, the method gives results 99 per cent theoretical. Salicylaldehyde under the same conditions gave 95-5 per cent theoretical; anisic aldehyde, 100 per cent;-hydroxy benzaldehyde, 101-5 per cent; vanillin, 102 per cent. For general application dilute HCl is recommended, and the estimations were carried out as follows: --The-nitrophenylhydrazine dissolved in dilute HCl (approximately normal strength) was added, drop by drop, from a pipette into the aldehyde solution, which had previously been diluted with 75 c.c. of water. The mixture was stirred vigorously during precipitation and allowed to stand half an hour before filtration. It was washed on a Gooch with dilute HCl, and then with water to absence of HCl, dried at 105-110 and weighed. Hydrazone x..


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Product Details
  • ISBN-13: 9781152415805
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 70
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1152415808
  • Publisher Date: 01 Jun 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 141 gr


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