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Re: Aquatic Plants Digest V3 #647
> What about this as an alternative explanation: CO2 was driven off with
> chloride salts remaining.
While the HCl was interacting with the CaCO3 this was happening. But
alkalinity refused to go lower than 40ppm even after several doses.
> The pH probably rebounded not only from the loss
> of CO2, but also from more calcium carbonate dissolving from old snail
> shells, etc.
No snail shells, no carbonate in the gravel. Nothing at all to induce this
reaction in a bare tank with nothing but water and a lid. I can accept the
CO2 loss thing, but pH went down and back up even after the reaction with
carbonates stopped. And at one time I drove it all the way to 5.0 and the
next day it was back to 7.4. CO2 can't account for that.
> I never heard that HCl gas was produced from anything but the
> most concentrated hydrochloric acid solutions.
It does its own equilibrium thing, just like anything else. I also observed
that the pH would take 30% longer to rise all the way when I used a very tight
fitting lid. on the tank. Gas-off is the only explanation I have. Anyone
want to offer another?