sulfite vs NH3

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

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JustinHorriat_4f
Posts: 111
Joined: Wed Sep 18, 2019 12:19 am

sulfite vs NH3

Postby JustinHorriat_4f » Sun Nov 17, 2019 11:32 pm

Why in the lecture the bond angles for sulfite which has 3 bond pairs and one lone pair, is different than the NH3 which also has 3 bond pairs and 1 lone pair

Rida Ismail 2E
Posts: 139
Joined: Sat Sep 07, 2019 12:16 am

Re: sulfite vs NH3

Postby Rida Ismail 2E » Mon Nov 18, 2019 12:57 am

It is different because the different atoms and lone pairs cause a varying bond angles. The repulsion seen in sulfite vs ammonia is different because of the ways in which each individual lone pair interacts with the other atoms.

Julie_Reyes1B
Posts: 105
Joined: Sat Jul 20, 2019 12:16 am

Re: sulfite vs NH3

Postby Julie_Reyes1B » Mon Nov 18, 2019 1:03 am

They are both the same shape- trigonal pyramidal-. Because the lone pair forces the bonding electrons closer together, the angles between the bonding pairs are smaller than 109°. This is true for both. The only difference is the O-S-O bond angles are 106° and the H-N-H bond angles are 107°. However, this is a small and pretty unnecessary detail. All in all, they are both good examples of how lone pairs force bonding electrons closer together than expected.


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