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Re: KH drop

> From: Paul Krombholz <krombhol at teclink_net>
> Subject: Re: KH Drop
> You changed the substrate, added driftwood, and you started adding 
> DIY CO2.  Of the three changes, I think the CO2 additions would have 
> the greatest effect on lowering the KH.

	Adding CO2 has _no_ effect on the KH.  The KH or alkalinity
is the bicarbonate concentration.  Adding CO2 does not change that.
It _does_ change the CO2/HCO3- ratio, and hence the pH, but when
the titration is done to measure the KH, you still need the same amount
of _strong_ acid to get to the endpoint, because you have to destroy
essentially all the HCO3- to get to pH 4.2.  

Paul Sears        Ottawa, Canada