The [OH^-] in a 0 $\times$ 10^-9)solution Is
A)1 $\times$ 10^-9 M
B)3

The [OH^-] in a 0.87 M pyridine (C₅H₅N;K_b = 1.7 $\times$ 10^-9) solution is

A) 1.5 $\times$ 10^-9 M
B) 3.8 $\times$ 10^-5 M
C) 0.87 M
D) 4.4 $\times$ 10^-5 M
E) none of these