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[APD] RO water and pH

The ph of distilled water will only be 7.0 if there are no dissolved gases. It has no buffer capacity and only slight changes in dissolved gases (H and CO2) will have a dramatic effect on ph.

I just measured DI water to have a ph of 6.5, but breathing on it reduced it ph.

> Message: 8 > Date: Wed, 10 Mar 2004 14:13:02 -0800 (PST) > From: Rod Gerrymander <rgerrymander at yahoo_com> > Subject: [APD] RO water and pH > To: aquatic plants digest <aquatic-plants at actwin_com> > > In my experience, with the el cheapo kits I am likely > to use and with my famously poor lab technique, the > pH of distilled water is simply not measurable. I > presume it is 7.0, but couldn't prove it. > > Maybe you are having the same sort of trouble with > RO water? > > Thanks, > Rod

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