ISO 2993:1974

Ammonium sulphate for industrial use — Determination of free acidity — Titrimetric method

STANDARD published on 1.4.1974

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The information about the standard:

Designation standards: ISO 2993:1974
Publication date standards: 1.4.1974
The number of pages: 2
Approximate weight : 6 g (0.01 lbs)
Country: International technical standard
Category: Technical standards ISO

Annotation of standard text ISO 2993:1974 :

Description / Abstract: Applicable to products having a free acidity, expressed as H2 SO4 , equal to or more than 0.01 % (m/m). Dissolution of a test portion in Water and titration with standard volumetric sodium hydroxide solution in the presence of an indicator. The indicator must have a colour change in the pH range between 5.2 and 5.6. Has also been approved by the IUPAC.