Which of these correctly defines the pOH of a solution?

a. pOH=log[H3O ]

b. pOH=-log[H30 ]

c. pOH=log[OH-]

d. pOH=-log[OH-]

The acid potential of aqueous solutions is measured in terms of the pH scale. The symbol "p" means take the negative logarithm of whatever follows in the formula for pH, pO, p[anything].

We can define the pOH as

pOH = - log [OH-]

In words, the pOH is the negative logarithm of the hydroxide ion concentration.

pOH is a measure of the alkalinity of a solution. Aqueous solutions at 25 degrees Celsius with pOH less than 7 are alkaline, pOH greater than 7 are acidic and pOH equal to 7 are neutral.