Polarity for a trigonal planar molecule

(Polar molecules, Non-polar molecules, etc.)

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sarahsalama2E
Posts: 164
Joined: Fri Aug 30, 2019 12:16 am

Polarity for a trigonal planar molecule

Postby sarahsalama2E » Thu Dec 05, 2019 3:40 pm

I had a question regarding a question about HNO3, When I drew the lewis structure I got that it is a trigonal planar structure, and the N is sp2 hybridized. Because all the atoms attached to the N are the same (they are all O), and the structure is trigonal planar, I thought that that the molecule overall would not be polar. Could someone please explain why the molecule is polar?

sarahsalama2E
Posts: 164
Joined: Fri Aug 30, 2019 12:16 am

Re: Polarity for a trigonal planar molecule

Postby sarahsalama2E » Thu Dec 05, 2019 3:41 pm

I am wondering if it is because the H that is attached to one of the O, so then the dipoles wouldn't cancel?

Indy Bui 1l
Posts: 99
Joined: Sat Sep 07, 2019 12:19 am

Re: Polarity for a trigonal planar molecule

Postby Indy Bui 1l » Thu Dec 05, 2019 3:44 pm

The molecule is polar just because of the hydrogen bonded to one of the Oxygens. This makes the entire molecule not symmetrical, making it polar, even though the shape of the central nitrogen is trigonal planar.


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