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ffixcth
Junior Member
Joined: 16 Feb 2005
Posts: 8
Location: Singapore
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 Posted: Mon Mar 07, 2005 1:33 pm Post subject: Testing for nitrate |
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When testing for nitrate, aluminium and NaOH is add to the test substance and heat it, the aluminium will first react with the NaOH to give hydrogen and the hydrogen reduce the nitrate to ammonia.
When aluminium react with NaOH, what is the other product except hydrogen???
Al + NaOH --------> H2 + ?????????
can anyone tell me?
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charco
Regular
Joined: 07 Mar 2005
Posts: 96
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| Posted: Mon Mar 07, 2005 11:54 pm Post subject: |
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Sodium aluminate (ionic)
In solution Na+(aq) and Al[(H2O)2(OH)4]-(aq) ions
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RobJim
Senior Member
Joined: 13 Feb 2005
Posts: 320
Location: Los Angeles, CA
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| Posted: Wed Mar 09, 2005 6:09 am Post subject: |
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Aluminate ion is Al(OH)4(-).
Last edited by RobJim on Wed Mar 09, 2005 12:26 pm; edited 1 time in total |
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charco
Regular
Joined: 07 Mar 2005
Posts: 96
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| Posted: Wed Mar 09, 2005 7:33 am Post subject: |
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The aluminate ion is basically (no pun intended) the hexaaqua aluminium III ion with four protons removed from four of the water molecules...
thus [Al(H2O)6]3+ ---> Al[(H2O)2(OH)4]- +4H+
or if you show then being removed by base (more correct)
[Al(H2O)6]3+ + 4OH- ---> Al[(H2O)2(OH)4]- +4H2O
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RobJim
Senior Member
Joined: 13 Feb 2005
Posts: 320
Location: Los Angeles, CA
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| Posted: Wed Mar 09, 2005 12:29 pm Post subject: |
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I didn't mean to correct you. I didn't realize you had posted the structure of the ion, so I looked it up on the internet to clarify your post for the reader. I got the structure I posted from here after a brief Google search:
http://www.uncp.edu/home/mcclurem/ptable/al.htm
I myself know nothing about aluminate ions.
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