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ISO 2174:1990-ed.3.0

Surface active agents — Preparation of water with known calcium hardness

NORM herausgegeben am 5.4.1990

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The information about the standard:

Designation standards: ISO 2174:1990-ed.3.0
Publication date standards: 5.4.1990
The number of pages: 4
Approximate weight : 12 g (0.03 lbs)
Country: International technical standard
Kategorie: Technische Normen ISO

Annotation of standard text ISO 2174:1990-ed.3.0 :

Description / Abstract: A stock solution is prepared by dissolving an appropriate quantity of calcium chloride in water. The calcium content of this stock solution is determined by complexometric titration with the disodium salt of (ethylenedinitrilo)tetraacetic acid (EDTA) using a mixture of Mordant Black 11 (C.I. 14645) and methyl red as indicator. Dilute solutions of the hardness required are prepared by dilution of appropriate volumes of the stock solution.