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Topic: When metallic aluminum is added to a solution of HCL, what happens?  (Read 18592 times)

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megan7880

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Can anyone please help me on this?

Offline Donaldson Tan

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Re:When metallic aluminum is added to a solution of HCL, what happens?
« Reply #1 on: July 17, 2004, 02:03:43 PM »
No visible change will be observed.

Although Al is highly placed in the Metal Reactivity Series, metallic Al wont react aq HCl because in its natural state, the Al sheet would be coated with an inert layer of amphoteric Aluminum Oxide. This layer provides sacrificial protection against corrosion. It prevents Al from being in actual contact with the acid. Hence, the typical metal-acid reaction won;t occur.
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Re:When metallic aluminum is added to a solution of HCL, what happens?
« Reply #2 on: July 17, 2004, 05:48:43 PM »
No visible change will be observed.

Although Al is highly placed in the Metal Reactivity Series, metallic Al wont react aq HCl because in its natural state, the Al sheet would be coated with an inert layer of amphoteric Aluminum Oxide. This layer provides sacrificial protection against corrosion. It prevents Al from being in actual contact with the acid. Hence, the typical metal-acid reaction won;t occur.

Sorry Geo, but you couldn't be more incorrect.   :P  Aluminum metal will most definitely react with a solution of hydrochloric acid.  The aluminum-oxide layer protects the metal from reaction against water, but hydrochloric acid is a different story.  HCl will eat through that layer after a while.  So while the reaction won't proceed very fastly, it will eventually take off.  It generally takes a few minutes for the reaction to get going if the HCl isn't concentrated.  In a dilute solution, it can take three to five minutes for the HCl to remove the protective layer.  Once the layer is gone, however, the reaction will proceed very quickly.  
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Offline Donaldson Tan

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Re:When metallic aluminum is added to a solution of HCL, what happens?
« Reply #3 on: July 18, 2004, 01:27:47 PM »
heh! u r right.. forgot that aluminum oxide can be used up by HCl
"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006

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