Answer: 1 x 10^-12 M
Explanation:
pOH is the negative logarithm of hydroxide ion concentration in a base.
Mathematically, pOH is expressed as
pOH = -log(OH-)
where OH- is hydroxide ion concentration
So, 12 = -log(OH-)
(OH-) = Antilog (-12)
(OH-) = 1 x 10^-12 M
Thus, the concentration of the base is 1 x 10^-12 M
