How is BF3 an acid,if there are no hydorhyd atoms in it?

Asked by pb_ckt | 28th Apr, 2019, 01:40: PM

Expert Answer:

According to Arrhenius Theory, acids are defined as a compound which release Hions.
According to Lewis Theory, acids are defined as a compound which accept electrons.
 
So Atomic number of boron is 5 and its electronic configuration is 2, 3. Its valency is 3. Flourine (2,7) valency is 1. Hence by sharing 1 electron with each fluorine atom, boron has 3 sigma bonds around it. In other words there are only 6 electrons around boron. In order to have the stable octet configuration it is in need of 2 more electrons. Since it can accept a pair of electrons it is a lewis acid.

Answered by Ravi | 28th Apr, 2019, 05:43: PM