International Standard
ISO 456:1973
Surface active agents — Analysis of soaps — Determination of free caustic alkali
Reference number
ISO 456:1973
Edition 1
International Standard
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ISO 456:1973
Published (Edition 1, 1973)
This standard was last reviewed and confirmed in 2022. Therefore this version remains current.

ISO 456:1973

ISO 456:1973
CHF 42
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The determination may be carried out in two different ways by the ethanol method or the barium chloride method. In the first case the soap is dissolved in neutralized ethanol, and the free caustic alkali is titrated with an ewthanol solution of hydrochloric acid. The second way includes precipitating of soap and carbonate with barium chloride and determining of the residual alkalinity of the solution, representing the alkalinity of the free potassium hydroxide.

General information

  •  : Published
     : 1973-03
    : International Standard confirmed [90.93]
  •  : 1
     : 3
  • ISO/TC 91
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