How can I make aluminum oxide?
It turns out to be surprisingly difficult to do, because aluminum forms a skin of oxide which retards further oxidation. One way might be to react aluminum with sulfuric acid, getting aluminum sulfate in solution. Treat this with barium hydroxide; barium sulfate will precipitate out, leaving aluminum hydroxide in solution. Dry this and heat it, driving off the hydroxide as water and leaving aluminum oxide. I haven't tried this, so cannot guarantee that it will work.
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