HW 4.13 part c

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

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Anna De Schutter - 1A
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Joined: Wed Feb 21, 2018 3:01 am

HW 4.13 part c

Postby Anna De Schutter - 1A » Mon May 28, 2018 10:13 pm

Hi!

Isn't the Lewis structure for IO3- an I with two O around it with double bonds and one O with a single bond instead of the one shown in the solutions manual (where I is attached to three O's, each with a single bond)?

The structure shown in the solutions manual would give the formal charges:
I = 7-2-6/2=+2
O = 6-6-2/2=-1

Whereas a structure with two double bonds and one single bond would give:
I = 7-2-10/2=0
O (single bond) = 6-6-2/2=-1
O (double bond) = 6-4-4/2=0

Thank you!
Anna De Schutter - section 1A

kimberlysanchez-1E
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Joined: Tue Nov 14, 2017 3:01 am

Re: HW 4.13 part c

Postby kimberlysanchez-1E » Mon May 28, 2018 10:40 pm

any corrections to the solutions manual is on the class website.

Anna De Schutter - 1A
Posts: 66
Joined: Wed Feb 21, 2018 3:01 am

Re: HW 4.13 part c

Postby Anna De Schutter - 1A » Mon May 28, 2018 10:53 pm

Yeah I looked at the solutions manual error document on the website but it didn't show an error for 4.13 so I'm confused as to what I'm doing wrong :( Do you see any errors in my reasoning? Thank you!! :)

Harmonie Ahuna-1C
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Joined: Fri Apr 06, 2018 11:01 am

Re: HW 4.13 part c

Postby Harmonie Ahuna-1C » Wed May 30, 2018 4:50 pm

I don't see any errors in your reasoning and I do think the 2 double bonded oxygens would produce a more favorable molecule. I guess the only good thing is that the whether they're double or single bonds wouldn't affect the shape or bond angles for the problem.

Celeste Martinez 1K
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Re: HW 4.13 part c

Postby Celeste Martinez 1K » Thu May 31, 2018 9:39 pm

The solutions manual states that there are other possible resonance forms so yours is right and the solutions manual's as well. It's just about which one is more stable but I don't think that matters when it comes to the shape of the molecule and bond angles.


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