The PH of a 1

Multiple Choice

The pH of a 1.00 liter solution of the weak base nicotine ( K _b = 1.05×10 ^{- 6}) is 10.20.
How many moles of nicotine were dissolved to form this solution?

A) 0.10
B) 3.8×10 ^{- 15}
C) 2.4×10 ^{- 2}
D) 1.05×10 ^{- 3}
E) 2.4×10 ^{- 4}