ISO 2993:1974

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

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ISO 2993:1974

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

PUBLISH DATE 1974
ISO 2993:1974

Applicable to products having a free acidity, expressed as H2SO4, 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.

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