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ISO 2993:1974
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ISO 2993:1974 Ammonium sulphate for industrial use -- Determination of free acidity -- Titrimetric method
standard by International Organization for Standardization, 04/01/1974
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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.