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Question:

what happens when we pour dilute hydrochloric acid on a copper plate?

i need it by 6th of july 2009

Answer:

Pure copper does not react appreciably with pure dilute HCl. However in air copper quickly tarnishes, being covered by a black layer of copper oxide. If a tarnished copper plate is dipped into dil HCl the copper oxide will be removed quite quickly. Try dipping a tarnished copper coin into Coca Cola - the phosphoric acid will make the coin shiny. One way to cut patterns into a sheet of copper (as when making an electronic printed-circuit board) is to stand a copper-clad board in a mixture of Hydrogen peroxide with Hydrocloric acid.
My guess is that it'll release Hydrogen and make Copper Chloride. I'd be leary of any flames near this experiment. Ever hear of the Hindenburg ??

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