Active standard | Published: 01/11/1974

ISO 684:1974

Analysis of soaps — Determination of total free alkali
(Analyse des savons — Détermination de la teneur en alcali libre total)

Available languages: English, French, Arabic

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Detail information

Designation: ISO 684:1974

Publication date: 01/11/1974

Pages: 2

Country: International technical standard

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Anotation

Description / Abstract: The soap is dissolved in an ethanolic solution, the free alkali is neutralized with a known excess of sulphuric acid solution and the excess acid is titrated with ethanolic potassium hydroxide solution. The method is not applicable if the soap cantains additives (alkali, silicates, etw.) which can be decomposed by sulphuric acid by the procedure specified. The method is also not applicable to coloured soaps if the colour interferes with the phenolphthalein end point.

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