To find the pOH of a solution, we can use the following formula:

pOH = -log[OH-]

where [OH-] is the hydroxide ion concentration in moles per liter.

Given that [OH-] = 9.31 x 10-2 M, we can substitute this value into the formula:

pOH = -log(9.31 x 10-2 M)

≈ 1.033

Therefore, the pOH of the solution is approximately 1.033.