Acid Base Equilibrium Practice Problem 8

did another question and got the right answer using -log[pOH] however when I tried it in the format of 10^-[pOH] I got a different answer. Does anyone know why? My work is attached below and the answer is 12.728.

hey
the formula is (H+) =10^-PH
you have put the concentration of OH- instead of PH
guess you mixed them up

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Also to find the H+ concentration use Kw = [H+][OH-] = 1.0 X 10-14 when substituting for OH- concentration

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