Which is the Lewis acid...#BF_3# or #NH_3#?

1 Answer
Feb 13, 2018

Boron trifluoride is an electron-pair ACCEPTOR, and is therefore a #"Lewis acid...."#

Explanation:

And with a weak Lewis base, i.e. an electron pair donor, for instance #Et_2O#, #BF_3# can form a #"Lewis acid/Lewis base adduct"#, i.e. #Et_2O*BF_3#, with a boiling point of approx. #126# #""^@C#...

And #NH_3#, is a weakish Bronsted BASE, i.e. an #"electron-pair donor"#, and therefore a #"Lewis base..."#