lewis vs bronsted

Moderators: Chem_Mod, Chem_Admin

Agustina Santa Cruz 2F
Posts: 88
Joined: Wed Sep 30, 2020 10:01 pm

lewis vs bronsted

Postby Agustina Santa Cruz 2F » Sun Dec 06, 2020 9:45 pm

What is the difference between a lewis acid/base and a bronsted acid/base?

Sahiti Annadata 3D
Posts: 89
Joined: Wed Sep 30, 2020 10:01 pm

Re: lewis vs bronsted

Postby Sahiti Annadata 3D » Sun Dec 06, 2020 9:47 pm

Lewis acids and bases describe the donation of an electron pair, while bronsted acids and base describe the transfer of protons.

Ryan Hoang 1D
Posts: 95
Joined: Wed Sep 30, 2020 9:49 pm

Re: lewis vs bronsted

Postby Ryan Hoang 1D » Sun Dec 06, 2020 9:49 pm

Agustina is correct!
Lewis bases are those that donate the electrons, while lewis acids acccept. Bronsted bases accept a proton while the acids supply a proton.

805593945
Posts: 43
Joined: Wed Sep 30, 2020 9:36 pm

Re: lewis vs bronsted

Postby 805593945 » Sun Dec 06, 2020 10:04 pm

Lewis acid accept lone pairs while lewis base donate lone pairs.
Bronsted acid gives proton, while bronsted base accepts proton.

Hasan Mirza 3F
Posts: 85
Joined: Wed Sep 30, 2020 10:00 pm

Re: lewis vs bronsted

Postby Hasan Mirza 3F » Sun Dec 06, 2020 10:05 pm

Lewis acids and bases focus on the movement of electrons, while bronsted looks at the movement of protons.

Andrew Yoon 3L
Posts: 87
Joined: Wed Sep 30, 2020 9:36 pm

Re: lewis vs bronsted

Postby Andrew Yoon 3L » Sun Dec 06, 2020 10:15 pm

Lewis acids and bases focus on the transfer of lone pairs of electrons. Bronstead acids and bases focus on the transfer protons.

Ellison Gonzales 1H
Posts: 93
Joined: Wed Sep 30, 2020 10:00 pm

Re: lewis vs bronsted

Postby Ellison Gonzales 1H » Sun Dec 06, 2020 11:20 pm

This is an example/explanation in the text book that I don’t fully understand and hoping to get some help on it :)
“The C atom of CO2, the Lewis acid, accepts an electron pair from the O of a water moleculethe Lewis base, and a proton migrates from an H2O oxygen atom to a CO2 oxygen atom. The product, an H2CO3 molecule, is a Bronsted acid.”
I don’t understand how a proton is transferred to CO2, if it is an acid since Bronsted Bases are typically the proton acceptors. I know that it was originally docked as a Lewis acid because it accepted the e- pair, but the second part throws me off.

Manseej Khatri 2B
Posts: 76
Joined: Wed Sep 30, 2020 9:42 pm

Re: lewis vs bronsted

Postby Manseej Khatri 2B » Sun Dec 06, 2020 11:45 pm

Hi. The difference, I believe, is on what you focus on. If we are focusing on protons, the Bronsted definition is used (acid being the proton donor, base being proton acceptor) where as if we focus on electrons the Lewis definition is used. The Lewis definition tends to be more fundamental as all acids can be seen as lone pair acceptors and not all acids have a hydrogen that can be made an H+ (take for example BCl3).

Elizabeth Kaplan 3I
Posts: 113
Joined: Wed Sep 30, 2020 9:32 pm

Re: lewis vs bronsted

Postby Elizabeth Kaplan 3I » Mon Dec 07, 2020 11:57 am

They are essentially describing the same thing, just emphasizing 2 different factors! Lewis acids/bases focus on electrons, while Bronsted acids/bases focus on protons. Lewis acids accept electrons, while Lewis bases donate electrons. Bronsted acids donate protons, while Bronsted bases accept protons.

jessicasilverstein1F
Posts: 122
Joined: Wed Sep 30, 2020 9:57 pm

Re: lewis vs bronsted

Postby jessicasilverstein1F » Mon Dec 07, 2020 2:15 pm

They are different definitions based on proton donating, accepting or electron donating, accepting.
Lewis acid accept electrons while lewis base donate electrons.
Bronsted acid gives proton, while bronsted base accepts protons.

Lorraine Medina 3E
Posts: 125
Joined: Wed Sep 30, 2020 10:11 pm

Re: lewis vs bronsted

Postby Lorraine Medina 3E » Thu Dec 10, 2020 11:22 pm

Hi! Lewis acids/bases and Bronsted acids/bases are basically saying the same thing but just have two different focuses. Bronsted acids/bases focus on protons, where the acids donate protons and the bases accept protons. Lewis acids/bases however focus on electrons, where the acids accept electrons and the bases donate electrons. Hope this helps!


Return to “Lewis Acids & Bases”

Who is online

Users browsing this forum: No registered users and 1 guest