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quote:Originally posted by eric lI'm not sure you got your reaction right. Have you checked the pH ? You could as well have a reaction giving Al2(SO4)3 ! Anyway, the contact surface of your aluminium foil with water would be Al2O3 rather than Al. It is possible that the increased concentration of ions by the addition of table salt makes it possible for the Al2O3 to dissolve either as Al(OH)3 or AlCl3, which would leave a "clean" Al surface for the coppersulphate to react upon. I've got to check.
quote:Originally posted by Mr AndrewYou're also probably at least partially right with the Cl- ions combining with the Al2O3 to give a clean Al surface for the redox reaction to occur on.