RE: [APD] pH at which CaCO3 dissolves -- or - CACO3 coming and going

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

Well, at *some* length but not a lot of length, depending
on the questions you might have.

For example, it seemed from the responses last week that
CaCO3 will dissolve and precipitate in the same water (at
the same pH).

Speed was mentioned but it's not clear to me what speed has
to do with it at all. Speed notwithstanding,m either is
dissolves or precipitates (but apparently both at the same
time).

And I wouldn't mind hearing an answer to Cheri's question
either. I can piece to gether a few possible answers based
on the recent discussion, or the archives, but . . .

Scott H.


--- Graham Broadbridge <graham at peachy_org> wrote:
> I thought that this was discussed at length over the last
> week or so :-)
> 
> Maybe check the archives. 
> 
> -----Original Message-----
> From: aquatic-plants-bounces+graham=peachy_org at actwin.com
>
[mailto:aquatic-plants-bounces+graham=peachy_org at actwin.com]
> On Behalf
> Of Cheryl Trine
> Sent: Sunday, 13 June 2004 2:25 PM
> To: aquatic-plants at actwin_com
> Subject: [APD] pH at which CaCO3 dissolves
> 
> 
> 
> At what pH does CaCO3 dissolve? pH=8.8
> 
> This is a question I have had for a while, also, because
> I get calcium
> deposits on my heaters which I have to remove
> periodically to keep the
> heaters working properly.
> I'm not questioning the calculations, but if it dissolves
> at pH of 8.8,
> why do I get these calcium deposit?.  My water has a pH =
> 8.2, and a dKH
> = 19, I think that is around 300 on the other scale
> (ppm?),
> 
> Thanks
> 
> Cheri 
> 
> _______________________________________________
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> 
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=====
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