> >you can add sodium carbonate (washing soda) or sodium hydroxide
> >to it to neutralize it

That only makes it less accute toxic, but it does not remove the
long-term toxity of the copper (at least not enough to satisfy most
regulations).

And yes, a reaction happens: Cu2+ combines with OH- or CO32- to form
some debris that contains the Cu2+ ions.

Wouter van Ooijen

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