Homework 3.57b

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Courtnie Ly
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Joined: Fri Sep 25, 2015 3:00 am

Homework 3.57b

Postby Courtnie Ly » Fri Oct 23, 2015 9:15 am

For 3.57b, it asks for the lewis structure of a hydrogen sulfite ion (HSO3-).
I have mine set up with sulfur as the central atom and 3 oxygens and a lone pair around it, and the sulfur is double bonded to one of the oxygens. Then, I also have the hydrogen bonded to the oxygen that is double bonded to sulfur, but the solutions manual has the hydrogen bonded to one of the other two oxygens that are single bonded to sulfur. Why can't the hydrogen be attached to the oxygen with a double bond?

Heerali Patel 3A
Posts: 26
Joined: Fri Sep 25, 2015 3:00 am

Re: Homework 3.57b

Postby Heerali Patel 3A » Fri Oct 23, 2015 7:37 pm

Technically, the hydrogen can be attached to the double-bonded oxygen, but it is preferable to attach it to the single-bonded oxygen because this gives a formal charge of zero for that oxygen. The hydrogen bonded to the double-bonded oxygen gives that oxygen a formal charge of -1, however, a zero formal charge produces a more stable atom.

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