The exact content of bauxite varies, but it is generally composed of aluminum oxide minerals ... normally insoluble in water, react with the sodium in the sodium hydroxide to form sodium aluminate ...

Sodium hydroxide is added to a cylinder of aluminum nitrate, precipitating out aluminum hydroxide. When additional base is added, the precipitate dissolves. The reactions can then be reversed with the ...

Using seawater, pure aluminum ... hydroxide. However, any aluminum that has had contact with atmospheric air immediately gets a coating of hard, unreactive aluminum oxide, which does not react ...