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Al(OH)3 as an electrolyte. What does it produce?

  1. Feb 6, 2016 #1
    I am running a dc current through a solution of Aluminum Hydroxide and I see a solid precipitating from the negative terminal, and bubbles coming from both terminals. Also, the positive terminal is corroding with little tiny holes in it. What is the solid being produced, and what is happening to the positive terminal. I know that the bubbles are hydrogen at the negative terminal, and oxygen at the positive terminal. I suspect that the solid is Aluminum Oxide, but I cannot find much proof through research.
  2. jcsd
  3. Feb 6, 2016 #2
    Do you use dissimilar electrode? What electrodes are you using?
    Probably yes, its AlO2. Reaction could be this Al(OH)3→H+1/2O2+AlO2
  4. Feb 6, 2016 #3


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    Are you sure about that form for aluminum oxide? It's common, stable form is Al2O3.
  5. Feb 6, 2016 #4
    I used two aluminum electrodes.
  6. Feb 6, 2016 #5
    Yes, my bad. That could also be the case. I think you are right about it.
    It's called Anodization of aluminium (page 5 of 11)
    Last edited by a moderator: May 7, 2017
  7. Feb 6, 2016 #6
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