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Re: CO2 levels and KH
<snip>> I know this is talking about a specific pH rather than a specific
> pH, but it still doesn't jive with what I've been reading lately on the
> APD, or for that matter with my real-world experience.
Sounds like you're over-complicating it all.
> Here's a question: Does it require more CO2 to change the pH, say, from
> to 7.0, than it does from 7.0 to 6.0?
The pH scale is logarithmic. A pH of 7.0 has ten times as many H+ ions and
one-tenth as many OH- ions as a pH of 8.0 . Same from 6 to 7. It takes more
CO2 to lower from 7.0 to 6.0 than from 8.0 to 7.0.
> Would that explain my pH's seeming
> reluctance to change at pH 7.8 and 7 dKH?
Nope. Well, actually, maybe. How's that for a definitive answer? THe
chemistry in your tank is unique to your tank, and there are probably other
factors you are overlooking, or failing to add into the mix.