Question

Identify the Lewis base in this balanced equation:

B is bonded to F above, below left, and below right. The F's have pairs of electron dots on the 3 sides that do not have bonds. Plus. A central N has two electron dots to the left and is bonded to H above, below, and to the right. right arrow. B is bonded above, below, and to the left to F's each with pairs of electron dots on the 3 sides without bonds; and to the right to N, which is bonded above, below, and to the right to H.


BF3

NH3

BF3NH3

Answer 1

NH3 is the Lewis base. A Lewis base donates an electron pair; the lone pair on nitrogen in NH3 is donated to the electron‑deficient boron in BF3 (which is the Lewis acid), forming a coordinate (dative) bond: H3N→BF3.