Sodium bicarbonate is added to water and allowed to come to equilibrium according to the reaction below: NAHCO, (aq) + H2O(1) = H2C03(aq) + NAOH(aq) At equilibrium the pOH of the solution is measured and found to be pOH = 12.138 at 25°C, what is the equilibrium OH-concentration? Please express your answer in scientific notation, with appropriate sig fig. Type your answer.

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