The Base- Dissociation Constant of Ethylamine (C₂H₅NH₂) Is 6

The base- dissociation constant of ethylamine (C₂H₅NH₂) is 6.4 × 10^{- 4} at 25.0 °C. The of [H⁺] in a 1.6 × 10^{- 2} M solution of ethylamine is M.

A) 3.2 × 10^{- 3}
B) 2.9 × 10^{- 3}
C) 11.46
D) 3.1 × 10^{- 12}
E) 3.5 × 10^{- 12}