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Homework Statement
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