Primarygun Posted December 26, 2005 Share Posted December 26, 2005 In Al anodization, object made of aluminium to be anodized is anode. In my text book, it said that oxygen is produced and oxidize aluminum to Al2O3. But, Al is a stronger reducing agent than OH-, why is OH- oxidized instead? Link to comment Share on other sites More sharing options...
woelen Posted December 27, 2005 Share Posted December 27, 2005 The Al is oxidized. You start with Al-metal (oxidation state 0) and end up with Al2O3. Here, the metal has oxidation state +3 and the O has oxidation state -2. In the OH(-) ions, oxygen also has oxidation state -2. So, the Al is oxidized and not the OH(-). Link to comment Share on other sites More sharing options...
Primarygun Posted December 31, 2005 Author Share Posted December 31, 2005 The overall result is that Al is oxidized. How about each step? My book said oxygen is first produced. I wonder about this. Link to comment Share on other sites More sharing options...
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