Question related with destilled water

Paul Conklin psconk at acpub.duke.edu
Wed Jun 16 16:00:22 EST 1993


In article <9306151433.AA05880 at net.bio.net> VJIMENEZ at UCRVM2.BITNET ("Victor M. Jimenez") writes:
>Hello,
>    I have a question related with the pH of destilled water for use in
>laboratory.
>    Is it supposed that destilled water has a pH of 7.0?  What happends if
>not?  Which would be the possible cause(s)?

Pure water does indeed have a pH of 7.0.  As soon as it is exposed to
air, though, CO2 disolves into it, forms a weak acid and lowers the pH 
to something in the range of 5.7.  This is a very dilute solution and
any salts or acids you mix in to make a buffer will completely mask the
CO2 effects.



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