Is ethylenediaminetetraacetatic acid (EDTA) a diprotic complexing agent?

2 answers

I'm doing a research on total hardness and I was wondering, what happens to th molarity of EDTA if I didn't add enough acid to the calcium carbonate slurry?
Since this is not my area of expertise, I searched Google under the key words "EDTA" to get these possible sources:

http://en.wikipedia.org/wiki/EDTA
http://www.umm.edu/altmed/articles/ethylenediaminetetraacetic-acid-000302.htm
http://www.3dchem.com/molecules.asp?ID=89
http://www.chm.bris.ac.uk/motm/edta/edtah.htm

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.

I hope this helps. Thanks for asking.