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Analysis of soaps -- Determination of total alkali content and total fatty matter content

  • Document Number: ISO 685:1975
  • File Size: 337 kB
  • Language: English
  • Provider: ANSI
  • Shipping: Available for download - Link will be provided in My ComplianceOnline section

Price: $43.00

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The method consists in decomposition of the soap by a known volume of standard volumetric mineral acid solution, extraction and separation of the liberated fatty matter with light petroleum and determination of a total alkali content by titration of the excess of acid contained in the aqueous phase with a standard volumetric sodium hydroxide solution. After evaporation of the light petroleum from the extract, dissolution of the residue in ethanol and neutralization of the fatty acids with a standard volumetric potassium hydroxide solution. Evaporation of the ethanol and weighing of the soap formed to determine the total fatty matter content.

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