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Oxidation state of TiO2?

  1. Aug 29, 2010 #1
    Hi there! I have a quick question that could use some clarification. According to my textbook, an oxygen atom has an oxidation state of -1 when in the polyatomic ion peroxide, although it's -2 in most other cases. However, I've come across this problem where it asks for the oxidation state of Ti in the compound TiO2. I figured it was +2 since each oxygen atom carries an oxidation state of -1 (because it's a peroxide) and -1(2) is -2, so Ti must have an oxidation state of +2, right? But then when I try to ease my qualms, every single post on the Internet points toward an oxidation state of +4. I don't understand! Is this titanium peroxide or titanium dioxide? Any help would be greatly appreciated.
  2. jcsd
  3. Aug 29, 2010 #2


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    Gold Member

    Peroxides technically have the oxygens bonded to each other. TiO2 is titanium dioxide. It has a oxidation state of +4 because the two oxygens are not bonded to each other and each have an oxidation state of -2. (Two oxygens each having -2 state vs. peroxide oxygen which has O2 (-2) state)
  4. Aug 30, 2010 #3


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    Staff: Mentor

    Tina already answered your question correctly. The simplest and shortest answer is: TiO2 is not a peroxide.
    Last edited by a moderator: Aug 13, 2013
  5. Aug 30, 2010 #4
    Thank you so much! :)
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