ISO 2993:1974
$13.00
Ammonium sulphate for industrial use — Determination of free acidity — Titrimetric method
| Published By | Publication Date | Number of Pages |
| ISO | 1974-04 | 4 |
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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