>
> > Here in Europe, it is claimed that the pH of oxalic acid must be equal
> to one to
> > be effective. A higher pH would not be effective, a lower would even be
> > harmful to the bees.
>

I concur with Allen that normal within-hive dilution and buffering will
likely make the amount of acid insignificant in a relatively short time.

The concept of pH and acidity are often confused.  The acidity is the total
chemical ability of a certain amount of the acid to react with other
chemicals.  The pH is the immediate degree of acidity in a solution.

Simply adding more acid does not decrease the pH, once the acid has reached
equilibrium in a solution, so any discussion of pH as far as oxalic seems
rather pointless to me, once you've gotten into the appropriate range.
-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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