Gave an example of a lewis base/acid?

Question

hey guys...

if a chem q on a test asks to:

a) give an example of a lewis base?

b) give an example of a lewis acid?

what do i write??

cheers :)

Answer 1

a) NH3

b) BCl3

Answer 2

Or you can look at it another way.  Since the Lewis acid/base theory is broader than either the Arrhenius or Bronsted/Lowry theories, ANY acid that is an acid in the other two theories will be an acid in the Lewis theory.  The same is true for bases.

Acid = H+

Base = OH-

product = H-OH  (H2O)