A particular solution has a [H3O+] 2.44 x 10^-4. Therefore, the [OH-]=

4.10 x 10^3
4.10 x 10^-11
2.44 x 10^-4
1.71 x 10^-8
9.09 x 10^-16

(H^+)(OH^-) = Kw = 1E-14