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Re: KH/CO2 question

> From: Cavan <millsman7 at yahoo_com>
> Subject: KH/co2 question
> Ok, about those co2/kh/ph charts.  Why is there more
> co2 at a higher KH?

	You need more CO2 to get the same pH at a higher KH.

>  If my KH is 2 and I add more
> carbonates but not more co2 (to KH 5), how could there
> be more co2?  Does this make sense?    

	If your KH was 2 and you added more (bi)carbonate, without
changing the CO2 concentration, the pH would rise.  If you go from
KH 2 to KH 5, the pH will rise by log(5/2) (about 0.4).

	As you rightly speculate, you can't get more CO2 by messing
about with the KH.

Paul Sears        Ottawa, Canada