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ReL [APD] CO2 Charts and High pH

Quoth Scott:

> > Just to be perfectly clear...
> > . . .  you can add CO2
> > to water with a high
> > pH and get the CO2 to rise, but when the CO2 rises the pH
> > will drop and the
> > water will no longer be at such a high pH.

> And then if you add more buffer along with the CO2 to try
> to raise the CO2 and maintain the pH at 8.5?

The bicarbonate increases, the CO2 decreases and you end up with only slightly
more CO2 then you started with.  The CO2/bicarbonate ratio is constant for any
given pH (neglecting changes with temperature and pressure).  You can't get
more CO2 at a given pH without increasing the bicarbonate.

Roger Miller
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