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Polarity for a trigonal planar molecule

Posted: Thu Dec 05, 2019 3:40 pm
by sarahsalama2E
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?

Re: Polarity for a trigonal planar molecule

Posted: Thu Dec 05, 2019 3:41 pm
by sarahsalama2E
I am wondering if it is because the H that is attached to one of the O, so then the dipoles wouldn't cancel?

Re: Polarity for a trigonal planar molecule

Posted: Thu Dec 05, 2019 3:44 pm
by Indy Bui 1l
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.