Answer: 2.35
Explanation:
pOH is the negative logarithm of hydroxide ion concentration in a solution. Mathematically, pOH is expressed as pOH = -log(OH-)
where (OH-) is the concentration of hydroxide ion.
So, pOH calculations are as follows
pOH = - log(4.5 x 10-3 M)
pOH = - (-2.3468)
pOH = 2.3468 (The minus signs cancelled out)
Then, round pOH value to the nearest hundredth: pOH is 2.35
Thus, the poH of a 4.5 x 10-3 M OH solution is 2.35
