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ISO 2993:1974

Ammonium sulphate for industrial use — Determination of free acidity — Titrimetric method ISO 2993:1974

Publication date:   Apr 1, 1974

General information

90.93 Standard confirmed   Jul 19, 2019

ISO

ISO/TC 47 Chemistry

International Standard

71.060.50   Salts

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Scope

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.

Life cycle

NOW

PUBLISHED
ISO 2993:1974
90.93 Standard confirmed
Jul 19, 2019