info on measuring pH in DI water

[Aquattro]

It's coming to me now <g> Although deionized and distilled water both have the same concentrations of H+ at any given pH. That can't change. Water = H2O = H+ + OH-. I'll have to read up on the exact definition of pH, whether activity and concentration are interchangeable. As a trivia point, pH comes from the latin phrase "pondus hydrogenii" or "weight of hydrogen".
I graciously back away from this topic until I can re-read my chem books again [img]images/smiles/icon_razz.gif[/img]