Lewis acid and base definition

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Matt Sanruk 2H
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Joined: Wed Sep 18, 2019 12:21 am

Lewis acid and base definition

Postby Matt Sanruk 2H » Thu Nov 28, 2019 6:18 pm

Can someone help me out with what a lewis acid and base is?

Noah Canio 3C
Posts: 55
Joined: Wed Sep 18, 2019 12:20 am

Re: Lewis acid and base definition

Postby Noah Canio 3C » Thu Nov 28, 2019 6:47 pm

When thinking about lewis acids and bases, think about what molecule/species donates or accepts an electron when combining to form a more complex molecule. The species that acts as an "electron donor" is the lewis base while the species that acts as an "electron acceptor" is a lewis acid.

One prime example of a lewis acid if I recall correctly in class was boron trifluoride. If you draw the lewis structure, its stable form consists of a central boron atom with three single bonds attached to it. A lewis base, such as a fluoride ion, could "donate" its own pair of electrons to the boron atom since the boron atom does not have a complete octet. The bond between a lewis acid and a lewis base is referred to as a "coordinate covalent bond."

Rebekah Alfred 1J
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Re: Lewis acid and base definition

Postby Rebekah Alfred 1J » Thu Nov 28, 2019 9:11 pm

Here's an image that depicts the example given about boron trifluoride:
Image

Lauren Tanaka 1A
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Joined: Sat Aug 17, 2019 12:18 am

Re: Lewis acid and base definition

Postby Lauren Tanaka 1A » Fri Nov 29, 2019 1:59 pm

A Lewis acid is a proton acceptor and a Lewis Base is a proton donor. Notice that this is different from the definition of bases and acids from the Bronsted-Lowry.

Matt Sanruk 2H
Posts: 131
Joined: Wed Sep 18, 2019 12:21 am

Re: Lewis acid and base definition

Postby Matt Sanruk 2H » Fri Nov 29, 2019 11:02 pm

Wow thanks for the replies guys and the diagram really helps thanks!


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