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Re: [APD] Question buffers

Jerry Smith wrote, in part:

"there are some good articles at http://www.thekrib.com such as
http://www.thekrib.com/Plants/CO2/hardness-larryfrank.html "

There are other errors than the one mentioned - for example, the ref cited

"CaCO3 forms Ca(HCO3)2 in water at pH less than 10.25 . (Two bicarbonates
are formed from each carbonate ion): ..."

The first statement above is true, the parenthetic comment is absolutely
untrue, one CO3-- cannot by the addition of a couple of hydrogen ions form 2
each HCO3-.  Creation of another carbon and three more oxygens is not simple
chemistry.  The equation given below that comment is correct however - the
parenthetic comment must have been a mental hiccup and should have been
edited out, especially when it is followed by correct info in the equation.
Or it could be made to read as "...when combined with water and CO2" if a
text form of the equation was felt to be needed for calarity to those
unfamiliar with chemical equations.

Larry Frank did an admirable job of trying to clarify hardness and
alkalinity, but it is not a chemical handbook yet.

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