Reference number
ISO 684:1974
ISO 684:1974
© ISO 2025
International Standard
ISO 684:1974
Analysis of soaps — Determination of total free alkali
Edition 1
1974-11
1974-11
ISO 684:1974
4879
Published
(Edition 1, 1974)
This publication was last reviewed and confirmed in 2022.
Therefore this version remains current.
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.