Embarrassing question about BF3

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Davis Chong 4H
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Joined: Wed Sep 21, 2016 2:56 pm

Embarrassing question about BF3

Postby Davis Chong 4H » Sun Nov 27, 2016 9:58 pm

Why exactly is BF3 a Lewis acid?
I understand that the Lewis dot diagram gives it 6 out of 8 electrons on the valence shell so thus it'd want another electron pair, making it an electron pair acceptor - but then wouldn't the formal charges be thrown off and not be optimal? Is there a hierarchy in considering valence, formal charge, etc etc? If so, what is it?

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Joined: Fri Jul 15, 2016 3:00 am

Re: Embarrassing question about BF3

Postby Jeannie_Kim_1I » Sun Nov 27, 2016 11:10 pm

Boron can break the octet rule. So you could add a lone pair to BF3 (which, by the way, doesn't even follow the octet rule anyway), which is why BF3 is a Lewis acid.

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