Video: Aluminum: reaction with acid and base
As an amphoteric metal, aluminum reacts with both acid and base.
2 Al(s) + 6 H+(aq) ® 2 Al3+(aq) + 3 H2(g)
2 Al(s) + 2 OH-(aq) + 6 H2O(l) ® 2 [Al(OH)4]-(aq) + 3 H2(g)
The identity of the transient fine black precipitate that appears in the acid reaction is unknown to the authors.