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Why is bubble present, in this redox reaction?

  1. Nov 19, 2009 #1
    1. The problem statement, all variables and given/known data
    In the lab, i saw that when Mg(s) attach with Fe(s) nail in a yellow solution( probably indicator), after one day, the brown substance and bubble are formed.
    My net ionic equation is
    SOA: O2(g) +2H2O(l) +4e -->4OH-
    SRA: Mg(s) --> Mg2+ +2e
    NIE: O2(g) +2H2O(l) +2Mg(s)-->4OH- +2Mg2+
    Can anyone explain why is bubble formed? and what is the brown substance?(is it MgO or Mg(OH)2, or Fe something??)
    Thanks
    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Nov 21, 2009 #2
    I immagine it might simply be iron oxide... rust
     
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