Question

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

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