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ISO 2174:1990

Surface active agents — Preparation of water with known calcium hardness

Standard Details

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.

General Information

Status : Published
Standard Type: Main
Document No: ISO 2174:1990
Document Year: 1990
Pages: 4
Edition: 3

Life Cycle

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ISO 2174:1990

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