ISO 685:1975 Preview

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

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.


General information

  • Current status : Published
    Publication date : 1975-10
  • Edition : 1
    Number of pages : 3
  • :
    ISO/TC 91
    Surface active agents
  • 71.100.40
    Surface active agents

Buy this standard

Format Language
PDF
Paper
  • CHF38

Got a question?

Check out our FAQs


Customer care
+41 22 749 08 88

Opening hours:
Monday to Friday - 09:00-12:00, 14:00-17:00 (UTC+1)