Surface active agents Preparation of water with known calcium hardness

Available format(s)

Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users

Language(s)

English, French

Published date

04-05-1990

Publisher

International Organization for Standardization

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.

DocumentType	Standard
Pages	4
PublisherName	International Organization for Standardization
Status	Current
Supersedes	ISO 2174:1979

Standards	Relationship
NS EN 12829 : 2011	Identical
I.S. EN 12829:2011	Identical
BS EN 12829:2011	Similar to
NBN ISO 2174 : 1994	Identical
UNE 55524:1992	Identical
DIN 53910:1986-09	Similar to

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