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Aluminum reacts with hydrochloric acid, 5 of 6

Aluminum reacts with hydrochloric acid, 5 of 6

C043/6243

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Credit

TURTLE ROCK SCIENTIFIC / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY TURTLE ROCK SCIENTIFIC / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY

Caption

Aluminum reacts with hydrochloric acid, 5 of 6. Aluminum metal has a very thin but strong aluminium oxide (Al2O3) on its surface. For the first minute or so, there are no visible signs of a reaction as aluminium oxide is dissolved by the acid. After that hydrogen (H2) bubbles start to appear, temperature rises and the reaction speeds up greatly: Al + HCL -> AlCl3 + H2. As hydrochloric acid is used up, the reaction comes to a halt. This is an example of a single displacement reaction.

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