1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Oxidation number question

  1. May 18, 2015 #1
    1. The problem statement, all variables and given/known data
    The problem is:

    Find the oxidation number of each element in the compound: Pb(O)2

    I said oxidation number of Pb = x, O = -1 since this is a peroxide, therefore oxidation number of Pb is plus 2. However, the solution manual says O is -2 and thus Pb is 2.

    But elsewhere, for the problem BaO2, they say the oxidation number of O is -1 and Ba is +2.

    I'm confused.

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. May 18, 2015 #2


    User Avatar

    Staff: Mentor

    PbO2 is not a peroxide.
  4. May 18, 2015 #3


    User Avatar
    Homework Helper
    Gold Member

    Not clear whether it is the manual or you who is saying Pb in PbO2 is +2 but now hopefully not.

    I have a vague recollection that lead dioxide did sometimes get improperly and misleadingly called "lead peroxide",
    probably before chemical nomenclature was formalised and the name still hangs around.
  5. May 18, 2015 #4

    James Pelezo

    User Avatar
    Gold Member

    Borek is 100% right, it ain't a peroxide ... Hint: Oxy = -2, Calculate oxidation state of Pb.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted