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Which pH level is the most conducive to the corrosion of copper and iron

2006

I'm fifteen and I'm a secondary three student. I've finished the experiment on which pH level is most conductive to the corrosion of copper and iron and I am a bit puzzled by the results.
If hydrochloric acid is added to copper, what is the green solution formed and what is the brown precipitate floating on top of the water?
Similarly, if hydrochloric acid is added to iron, what is the dark grey layer over the iron fillings?
And what is the orangey-brown layer floating on the surface of the solution?

Oong Pin F.

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