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ISO 685:1975
Analysis of soaps - Determination of total alkali content and total fatty matter content


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Abstract

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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Document Type Standard
Status Current
Publisher:    ISO



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$75.40
Published:   01 Oct 1975  
Pages: 3
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Published:   01 Oct 1975  
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