What factor determines whether an acid or base is strong or weak? A)The number of hydroxide ions.
B)The number of hydronium ions.
C)The extent to which the acid or base ionizes.

i think it's c

Explanation:

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.