2
$\begingroup$

I am looking for the less harmful chemical solution to serve as an etching solution. After many searches, my interest went to a vinegar/salt/hydrogen peroxide solution.

I have to ask then if the residue of this solution is harmful and if it is ok to pour it in the regular water waste system.

$\endgroup$
4
$\begingroup$

The etching solution itself is fine to dispose of down the drain. However, if you use it to etch copper, the dissolved copper ions are quite toxic, and should not be disposed of through the sewer system.

You can bypass the problem by collecting the etch solution, and submerge aluminum foil. $$\ce{3Cu(CH3COO)2(aq) + 2Al(s)->2Al(CH3COO)3(aq) +3Cu(s)}$$React with the aluminum until the bluish color disappears, then collect the solid copper + remaining aluminum to throw in the trash. You can now flush the solution down the drain.

$\endgroup$
  • $\begingroup$ In your reaction, above, it should be $\ce{Al(CH3COO)_{3}}$ and not $\ce{Al(CH3COO)_{2}}$. Then it needs to be properly balanced. $\endgroup$ – Todd Minehardt Aug 4 '15 at 21:39
  • $\begingroup$ Hi @DanBurden, are you able to add to your answer the etching equation that shows vinegar, salt, hydrogen peroxide, and copper becoming Cu(CH3COO)2? $\endgroup$ – Jet Blue Sep 10 '18 at 1:14

Your Answer

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Not the answer you're looking for? Browse other questions tagged or ask your own question.