 Aluminium and NaOH solution
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john bunsenburner
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Mon Mar 30 2009, 09:08AM
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Registered Member #1937
Joined: Sun Jan 25 2009, 12:28PM
Location:
Posts: 53
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I have argued about which of the followign reactions is correct, please remember how quickly aluminium builds up and oxide layer. Note that the reactions are not balanced
Reactions a:
Al2O3+NaOH(aq)-->Al(OH)3(aq)+Na2O
Na2O+H2O--
>NaOH
Al+H2O-->Al2O3+H2
Reactions b:
Al2O3+NaOH(aq)-->Al(OH)3(aq)+Na2O
Na2O+H2O--
>NaOH
Al+NaOH-->H2+Na3AlO3
Thanks for answers and comments in advance.
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Bored Chemist
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Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
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Na2O will never form in water.
A better answer might be
Al2O3 + 3 H2O --> 2 Al(OH)3
Al(OH)3 + OH- ---> [Al(OH)4]-
but even that's a simplified version.
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john bunsenburner
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Registered Member #1937
Joined: Sun Jan 25 2009, 12:28PM
Location:
Posts: 53
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But what is the whole set of things that happens? After all hydrogen is formed in the end is it not?
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