The correct answer is:
The negative log of the hydroxide ion concentration.
Explanation:
The pOH is a standard of hydroxide ion (OH-) concentration. pOH is a step of the alkalinity of a solution. Aqueous solutions at 25°C with pOH less than 7 are alkaline, pOH greater than 7 are acidic and pOH equal to 7 are neutral.pOH scale can be determined as follows
pOH = -log[OH⁻]
[OH⁻] is the hydroxide ion concentration,therefore pOH is the negative log of the hydroxide ion concentration