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Aluminium Anodization

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in Inorganic Chemistry

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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?

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(-).

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The overall result is that Al is oxidized.

How about each step? My book said oxygen is first produced.

I wonder about this.

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