Lewis Acid and Base in Reaction

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KMcFarland_2L
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Joined: Wed Sep 30, 2020 9:52 pm

Lewis Acid and Base in Reaction

Postby KMcFarland_2L » Wed Dec 09, 2020 8:25 am

When given a reaction, how do you identify which is the Lewis acid and which is the Lewis base in the reaction?

Sydney Lam_2I
Posts: 96
Joined: Wed Sep 30, 2020 10:09 pm

Re: Lewis Acid and Base in Reaction

Postby Sydney Lam_2I » Wed Dec 09, 2020 8:29 am

Hi!

So a lewis acid will be a molecule or ion that accepts an electron (so look for molecules that are able to hold more electrons) while lewis base will be a molecule or ion that is more likely to give off electrons.

Gabby Magat 3F
Posts: 108
Joined: Wed Sep 30, 2020 10:04 pm

Re: Lewis Acid and Base in Reaction

Postby Gabby Magat 3F » Wed Dec 09, 2020 8:41 am

An example for a Lewis acid would be a molecule with an electron deficient central atom (or a central atom with a positive formal charge).

Likewise, an example for a Lewis base would be a molecule with excess electrons, like lone pairs!

AnnaNovoselov1G
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Re: Lewis Acid and Base in Reaction

Postby AnnaNovoselov1G » Wed Dec 09, 2020 9:06 am

A Lewis acid can accept a pair of nonbonding electrons and a Lewis base can donate a pair of nonbonding electrons.

In the example, you can see that NH3 has a lone pair of electrons. The BF3 can react with it to form the stable compound NH3BF3
The NH3 acts as a Lewis acid and the BF3 acts as a Lewis base
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OwenSumter_2F
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Re: Lewis Acid and Base in Reaction

Postby OwenSumter_2F » Wed Dec 09, 2020 10:48 am

Also make sure to take into account that Lewis acids and bases correspond to donating lone pair electrons, while Bronsted acids and bases correspond to donating H+ ions.


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