On Thu, 20 Apr 1995, Alistair Bell wrote: > > > Dug up the ol' chemical reaction that goes on in a battery. > > Take a deep breath: > > remember, the battery is made up of alternating lead and lead oxide plates, > with sulfuric acid as an electrolyte. > > the electrolyte contains hydrogen ions (H+) and sulphate ions (SO4--). > During discharge, H+ ions react with the lead(IV) oxide to give > lead(II)oxide and water; > > PbO2 + 2H+ + 2e- -> PbO + H2O > > the reaction takes electrons from the plate, causing a positive charge. > There is a further reaction to yield soft lead sulphate; > > PbO + SO4-- + 2H+ -> PbSO4 + H2O + 2e- > > electrons are released to the electrode, producing a negative charge. > > You can see how the production of H2O accounts for the lower specific > gravity in a discharged battery. > > During charging the reactions are reversed; > > PbSO4 + 2e- -> Pb + SO4-- > PbSO4 + 2H2O -> PbO2 + 4H+ + SO4-- + 2e- > > Now the specific gravity of the electrolyte (sulfuric acid) increases. > > I still can't see where EDTA would fit in. > I don't see any divalent cations... > > Alistair > > It's only effective when the battery is in a discharged state, if that's any help (still haven't located those papers, but I will)... Jack
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