Thiosulfate ion shape

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Jade Fosburgh Discussion 2C
Posts: 59
Joined: Fri Sep 29, 2017 7:07 am

Thiosulfate ion shape

Postby Jade Fosburgh Discussion 2C » Sun Nov 12, 2017 5:19 pm

Why is the (S2O3)2- ion tetrahedral and not see saw shaped?

What is the method for deciding what the shape is after you determine the VSEPR formula (i.e. AX4E1 for this ion)? I never know which side to put the lone pair

Janine Chan 2K
Posts: 71
Joined: Fri Sep 29, 2017 7:04 am

Re: Thiosulfate ion shape

Postby Janine Chan 2K » Sun Nov 12, 2017 5:30 pm

There actually is no lone pair around the S. I believe the Lewis structure is just a sulfur atom in the middle, surrounded by 3 oxygen atoms and 1 other sulfur atom. Since there are 4 bonding pairs around the central atom, it would be a tetrahedral shape.

Danah Albaaj 1I
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am

Re: Thiosulfate ion shape

Postby Danah Albaaj 1I » Sun Nov 12, 2017 5:43 pm

I agree with what was stated above, and in regards to where you should put a lone pair on the central atom. You want to put it the farthest you possibly can from any bonds or other lone pairs while keeping some symmetry with the rest of the bonds and their angles.


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