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ISO 3196:1975

Current Revision

Sodium hydroxide for industrial use -- Determination of carbonates content -- Titrimetric method

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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.


SDO ISO: International Organization for Standardization
Document Number ISO 3196
Publication Date Not Available
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO TC 47
Publish Date Document Id Type View
Not Available ISO 3196:1975 Revision