One way is to look up the Eo values for each half cell (as written), add them together to obtain the reaction Eo. Positive means to the right. Negative means to the left. Or if you have an equilibrium constant, it would be, for the expression,
Keq = (OH^-)(OH^-)/(O^-2), Keq >1 goes to the right; Keq < 1 lies to the left, Keq = 1 is about 50/50.
How do I predict whether the equilibrium lies to the right or left of an Acid-base equation?
O[2-](aq) + H2O(l) <--> OH[-] + OH[-]
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