how to distinguish a Lewis Acid from a lewis base

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how to distinguish a Lewis Acid from a lewis base

Postby Chem_Mod » Sun Aug 21, 2011 11:54 am

I am unsure how to distinguish a Lewis Acid from a lewis base. For example, how do we know that BF3 is a Lewis acid?

Chem_Mod
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Re: how to distinguish a Lewis Acid from a lewis base

Postby Chem_Mod » Sun Aug 21, 2011 11:55 am

A Lewis base must have a lone pair of electrons avialable to pick up a proton. A Lewis acid must be able to accept a pair of electrons. Since boron in BF3 has 6 valence electrons it can accept 2 more giving it an octet.

In many cases it is helpful to know the Lewis structure or the electron configuration.


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