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CBSE Class 11-science Answered

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

Asked by pb_ckt | 28 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.
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