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If the KOH is in a moderately concentrated aqueous solution, the net reaction can be: 2 Al + 6 H2O => 2 Al(OH)3 + 3 H2. In this instance, the KOH does not undergo any net reaction; instead it catalyzes the reaction between aluminum and water by preventing the solid aluminum from maintaining a passivation layer on its surface.

If the KOH is in a still more concentrated aqueous solution, the reaction can be:

2 Al + 4 KOH => K2Al2O4 + H2.

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