International Standard
ISO 3196:1975
Sodium hydroxide for industrial use — Determination of carbonates content — Titrimetric method
Reference number
ISO 3196:1975
Edition 1
International Standard
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ISO 3196:1975
Published (Edition 1, 1975)
This standard was last reviewed and confirmed in 2023. Therefore this version remains current.

ISO 3196:1975

ISO 3196:1975
CHF 42
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Applicable to products having contents, expressed as CO2 , of more than 0.01 % (m/m). Relates to a procduct containing neither sulphides nor chlorates or only sulphides or only chlorates. Preliminary test by boiling an acidified test sample in the presence of methyl orange and with a lead acetate paper strip in the vapour. The sulphides blacken the paper and chlorates delolourize the methyl orange. Products containing neither sulphides nor chlorates: liberation of carbon dioxide by acidification and heating. Entrainment in a flow of gas and absorption in an excess of barium hydroxide solution. Titration of the excess barium hydroxide solution with a standard volumetric hydrochloric acid solution in the presence of thymolphthalein as indicator.

General information

  •  : Published
     : 1975-05
    : International Standard confirmed [90.93]
  •  : 1
     : 4
  • ISO/TC 47
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