Re: [APD] Adding Carbonates

["S. Hieber" <shieber at yahoo_com>]

Caronates and CO2 (dissolved in water some of it forms
carbonic acid) enter into an equilibrium readction. Add
more carbonate and the pH goes up, add more acid (CO2,
which makes carbonic acid) andthe pH goes down. That's why,
if you you know the pH and the KH (carbonates) you can
mathematically derive the amount of carbonic acid (CO2) in
the water.

Scott H.
--- Philippe Lemaire <ph_lemaire at CompaqNet.be> wrote:

> Hello,
> 
> why should more carbonate raise KH and not give off CO2 ?
> Or does it depend of the pH value ?
> 
> Philippe who got Magnesium Carbonate instead of Magnesium
> Nitrate...
> Philippe who has no Mg at all in the tap water !
> 
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