Question

what happens when BF3 is treated with NH3 answer soon

Answer 1

 BF3 is a lewis acid whereas NH3 is a lewis base. NH3 donates its lone pair to BF3 and forms a dipolar bond. NH3 gets a positive formal  charge and BH3 gets a formal negative charge

Answer 2

Answer:

Formation of trifluoroamine boron(III) will take place.

Explanation:

When boron trifluoride is allowed to get react with ammonia it gives an adduct as product named trifluoroamine boron(III).This reaction takes place at temperature lower than zero degree Celsius.

$NH_3+BF_3\rightarrow [B(NH_3)F_3]$