posted by eng .
A balanced equation that represents an overall cell reaction is shown. Choose the cell notation which corresponds to the electrochemical cell that is described by this equation.
2H2O(l) → 2H2(g) + O2(g)
i don't get why the answer is this. How can OH- appear in both sides
Pt(s) | OH-(aq) | O2(g) || OH-(aq), H2O(l) | H2(g), Pt(s)
The left hand cell is
2OH^- ==> O2 + 4e + 2H^+
The right hand cell is
4H^+ + 2e + 2OH^- ==> H2 + 2H2O