Re: [APD] Adding Carbonates

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

Think of carbonates as a base and CO2 (in water) as an
acid. Neither produces the other but each is a kind of
opposite to the other in terms of pH. One pushes pH down,
the other pushes it up. If you know how much you have of
one and the pH, given the way they affect pH, you can
determine how much you have of the other. This assumes, of
course that other pH affecting chems are not in the water
which is usually not the case, but he other things inthe
water are usually in small enough amounts that one can
still use the pH/KH/CO2 table to determine CO2 levels.

Adding more on one does not make more of the other but
reacts with the other.

Try digesting this post from way back in 1995:

http://fins.actwin.com/aquatic-plants/month.9505/msg00218.html

If you put some baking soda in water, it will push up the
pH, If you add some vinegar (acid), the pH will be driven
back in the other direction, but you won't produce baking
soda.

Scott H.

--- Philippe Lemaire <ph_lemaire at compaqnet.be> wrote:

> Thanks !
> 
> I need to add Mg for the Water Company only adds Ca to
> prevent
> corrosion from acid water...
> 
> It is still unclear why I can add carbonates as much as I
> want
> without producing CO2 !
> Does it mean there is no equilibrium ?
> 
> Philippe
> 
> 
> ----- Original Message ----- 
> From: "S. Hieber" <shieber at yahoo_com>
> To: "aquatic plants digest" <aquatic-plants at actwin_com>
> Sent: Thursday, November 18, 2004 11:31 PM
> Subject: Re: [APD] Adding Carbonates
> 
> 
> > Some carbonates, baking soda, only raise KH or
> carbonate
> > "hardness".
> >
> > There is noncarbonate "hardness" also, GH or general
> > Hardness for easy remembrance, that is largely a
> measure of
> > calcium and magnesium. So adding calcium carbonate
> raises
> > KH and GH both.
> >
> > Baking sodda dissolves readily in water and is cheap
> and
> > easily obtainable. Calcium carbonte is not readily
> > dissolved in water but provides a source of calcium, if
> you
> > need it.
> >
> > sh
> >
> >
> > --- Philippe Lemaire <ph_lemaire at compaqnet.be> wrote:
> >
> >> So adding Carbonates = adding KH ?
> >>
> >> Philippe
> >>
> >>
> >> ----- Original Message ----- 
> >> From: "Rachel Sandage" <rachelsor at hotmail_com>
> >> To: "aquatic plants digest"
> <aquatic-plants at actwin_com>
> >> Sent: Thursday, November 18, 2004 10:12 PM
> >> Subject: Re: [APD] Adding Carbonates
> >>
> >>
> >> > Warning: oversimplification.
> >> >
> >> > pH is a measure of the relationship between the KH
> and
> >> the amount of CO2. Add more
> >> > CO2, pH will fall. Add more KH, pH will rise.
> >> >
> >> > Rachel
> >> >  ----- Original Message ----- 
> >> >  From: Philippe
> Lemaire<mailto:ph_lemaire at CompaqNet.be>
> >> >  To: aquatic plants
> >> digest<mailto:aquatic-plants at actwin_com>
> >> >  Sent: Thursday, November 18, 2004 11:48 AM
> >> >  Subject: [APD] Adding Carbonates
> >> >
> >> >
> >> >  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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> >> >
> >>
> >
>
Aquatic-Plants at actwin_com<mailto:Aquatic-Plants at actwin_com>
> >> >
> >> >
> >>
> >
>
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