11 posts • Page 1 of 1
I was wondering if someone could explain the difference between a bronsted and a lewis acid. What's the difference between them? Is it possible for an acid to be both a bronsted and lewis acid?
Bronsted is concerned with proton presence/movement, and Lewis is concerned with electron presence/movement. I have found it helpful to remember that every Bronsted Base is a Lewis Base and every Bronsted Acid is a Lewis Acid, but these trends DONT work in reverse.
All acids are both Brønsted and Lewis acids. They are not actually separate things. They are two different ways to define an acid. Brønsted defines acids as proton donors, while Lewis defines acids as lone e- lone pair acceptors.
As Will Skinner said, they are essentially the same thing with different viewpoints. The Lewis model focuses on the movement of the electrons while the Bronsted model focuses on the proton. So a lewis acid looks at how electrons are accepted from an H+ while a Bronsted model looks at how a proton is gained from the H+
A Bronsted Acid is a proton donor, it donated an H+ while a lewis acid accepts an electron pair. You can think of H+ being a lewis acid because it cannot donate an electron pair and must instead accept an electron pair because it has no electrons to donate.
Who is online
Users browsing this forum: No registered users and 1 guest