On Thu, 20 Apr 1995 7039ckrah@umbsky.cc.umb.edu wrote:

> In response to Alistair's question on the EDTA use in batteries, my GUESS
> is that the EDTA functions as a chelator for all divalent ions.  EDTA has
> been used to reduce the activities of metals in solution (Activity refers
> to the free ion concentration) In lead acid batteries, the lead exists as
> Pb+2 when it is in solution.  Maybe adding EDTA complexes the Pb+2 such that
> it doesn't react and form the slightly insoluble sulfate salts
> 
> 
> it doesn't react and form the slightly soluble sulfate salts whixh can then
> accumulate and short out the battery.....
> christian
> 

Actually (again, please bare with me, I'm _not_ a chemist at home or at 
work), the sulfate covers the plates in a crytalline form, preventing the 
lead from reacting _well enough_ with the electrolyte.

Jack