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Lewis Acids and Bases?

Posted: Sun Nov 03, 2019 11:40 pm
by JustinHorriat_4f
Can someone Explain what Lewis Acids and Bases are and why they are an exception to the often rule? Also, what different rxns are they involved in?

Re: Lewis Acids and Bases?

Posted: Mon Nov 04, 2019 1:28 am
by IScarvie 1E
A Lewis acid is a lone pair acceptor, and a Lewis pair is a lone pair donor. I believe they are similar to covalent bonds, except they typically form as separate molecules and join to fulfill their individual needs

Re: Lewis Acids and Bases?

Posted: Tue Nov 05, 2019 7:38 pm
by Brittany Tran 3I
Lewis acids and bases involve coordinate covalent bonds, in which two atoms share a pair of electrons but both of the electrons come from one atom. Lewis acids are electron pair acceptors and Lewis bases are electron pair donors

Re: Lewis Acids and Bases?

Posted: Fri Nov 08, 2019 12:56 am
by Michelle Xie 2B
A lewis base would donate a pair of electrons and a lewis acid would accept a pair of electrons.

Re: Lewis Acids and Bases?

Posted: Fri Nov 08, 2019 2:15 am
by andrewcj 2C
A friend gave me the mnemonic "Lewis has e" which reminds me that Lewis acids and bases focus on electron exchange. After this, I just think about H+, which is acidic, and how it can accept electrons. Therefore, Lewis acids are electron acceptors.

Re: Lewis Acids and Bases?

Posted: Fri Nov 08, 2019 10:16 am
by lauraxie2e
an acid accepts a lone pair and a base gives one up

Re: Lewis Acids and Bases?

Posted: Fri Nov 08, 2019 10:24 am
by Nuoya Jiang
Lewis Acids are electron acceptors and Lewis Bases are electron donors.

Re: Lewis Acids and Bases?

Posted: Fri Nov 08, 2019 11:03 am
by 405335722
Michelle Xie 3A wrote:A lewis base would donate a pair of electrons and a lewis acid would accept a pair of electrons.

What is the acid/base name for the definition that says it donates/accepts protons? Is that a Bronsted acid/base?

Re: Lewis Acids and Bases?

Posted: Fri Nov 08, 2019 11:42 am
by Madeline Phan 1E
Lewis acids accept pairs of electrons, while Lewis bases donate entire pairs so they form coordinate covalent bonds since the bases are donating an entire pair of electrons.

Re: Lewis Acids and Bases?

Posted: Fri Nov 08, 2019 11:47 am
by Sartaj Bal 1J
@405335722 the Bronsted-Lowry acid base model states that protons are either accepted or donated.

Re: Lewis Acids and Bases?

Posted: Fri Nov 08, 2019 12:12 pm
by Eunice Nguyen 4I
Lewis acid is an electron pair acceptor, while Lewis base donates nonbonding electrons. The bond in which both electrons come from one of the atoms is called a coordinate covalent bond. You can find this information in 2C.3 in the textbook.

Re: Lewis Acids and Bases?

Posted: Fri Nov 08, 2019 10:06 pm
by MeeraBhagat
Lewis acids accept electron pairs and lewis bases donate that electron pair. The example that Dr. Lavelle used was with BF3 as a lewis acid and F- as a lewis base. Since Fluorine does not make double bonds, and since three fluorines bonded to a boron atom only gives boron 6 valence electrons, the only way for Boron to get an octet is to coordinate covalently bond with a lewis base, F- in this case, which provides both of the electrons needed to complete boron's octet.