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Posted 2007-06-25, 02:35 PM
in reply to !King_Amazon!'s post starting "Ah, my bad. The-Works is toilet..."
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Same difference. 
What happens is:
The reactions with the NaOH and the Al forms Hydrogen gas. Since it's a fairly violent reaction, a lot of the gas is formed, quickly, which causes a closed container to explode. Warm NaOH should be a lot more violent.
Oh, water is needed, too:
2Al (s) + 2NaOH (aq) + 6H 20 (l) ===> 2NaAl(OH) 4(aq) + 3H 2(g)
Basically it happens because the strong base (Sodium Hydroxide) attacks the aluminium and reacts with it.
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