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<p>[QUOTE=&quot;davidh, post: 1264306, member: 15062&quot;]In general, an acid will not react with copper, <u>unless there is oxygen present</u>.&nbsp; This is why Sulphuric Acid (H2SO4) and Nitric Acid (HNO3) will react and Hydrochloric Acid (HCl) will not.&nbsp; Copper is lower on the reactive scale than Hydrogen and will not displace it from the HCL.</p><p><br /></p><p>Hydrochloric Acid can be made to work on Copper only if Oxygen is added.&nbsp; The simplest way is to add Hydrogen Peroxide (H2O2) to the mix.&nbsp; The Oxygen adds an intermediate reaction which will end with the Copper being &quot;dissolved.&quot;</p><p><br /></p><p>If you drop a brown penny into Hydrochloric Acid you will get a reaction only because the acid is reacting to the Cupric Oxide on the surface of the penny.[/QUOTE]</p><p><br /></p>

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