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Homepage>ISO Standards>ISO 2993:1974-Ammonium sulphate for industrial use — Determination of free acidity — Titrimetric method
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download between 0-24 hoursReleased: 1974
ISO 2993:1974-Ammonium sulphate for industrial use — Determination of free acidity — Titrimetric method

ISO 2993:1974

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

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Standard´s number:ISO 2993:1974
Pages:2
Edition:1
Released:1974
DESCRIPTION

ISO 2993:1974


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.
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