Letter 17067

Scientific [chemical] reaction of hydrochloric acid and copper  

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I'd like to explain, to a 6th grade class, what is going on when we rub hydrochloric acid over their copper rubbings. Thank you for your help.

Joan Russell
- Bellevue, Washington

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I don't know quite what a "copper rubbing" is or what happens to it. In theory, though, hydrochloric acid does not dissolve copper but it does dissolve copper oxides.


Ted Mooney, P.E. 
finishing.com
Brick, New Jersey

May 19, 2008

Why does copper oxide dissolve in hydrochloric acid and how

John H.
student - Mt Vernon, Ohio

August 29, 2009

we have been doing descaling of copper shell and tube condensers with hydrochloric acid. what will be the reaction copper tubes? advise what precautions should be taken

RAJ K VERMA
end user - gurgaon haryana india

August 31, 2009

Hi, Raj. The reaction is pretty simple: HCl acid dissolves copper II oxide --

CuO + 2 HCl --> CuCl2 + H2O

But as for "what precautions should be taken", sorry, but there is no way to answer that question in the abstract. Good luck.

Regards,


Ted Mooney
finishing.com
Brick, New Jersey

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