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sklademVydáno: 1974
ISO 2993:1974
ISO 2993:1974-Ammonium sulphate for industrial use — Determination of free acidity — Titrimetric method
Měna
| Označení normy: | ISO 2993:1974 |
| Počet stran: | 2 |
| Vydání: | 1 |
| Vydáno: | 1974 |
Popis
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.