Why MgCl2 is added to the water sample before titrating with EDTA?

Subject: Why MgCl2 is added to the water sample before titrating with EDTA?

Date: Fri May 20 01:45:48 2011
Posted by Elaine
Grade level: grad (science) School: No school entered.
City: No city entered. State/Province: No state entered. Country: Malaysia
Area of science: Chemistry
ID: 1305881148.Ch

Message:


The standard method I found to test water hardness is by titrating with EDTA
solution and with Eriochrome Black T as indicator. I understand that Mg2+ and
Ca2+ ions are usually the main cause of water hardness, but why MgCl2 has to be
added to the water sample?? What is the purpose of doing so?

Re: Why MgCl2 is added to the water sample before titrating with EDTA?

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