What is the pOH of a 2.7×10-11 M solution of LiOH?

##pOH## ##=## ##10.57##

##pOH## ##=## ##-log_10[HO^-]##.
Thus ##pOH## ##=## ##-log_10(2.7xx10^-11)##.
Is this solution acidic or basic? How do you know?

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