Thiosulfate Ion

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

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Aman Sankineni 2L
Posts: 103
Joined: Fri Aug 30, 2019 12:17 am

Thiosulfate Ion

Postby Aman Sankineni 2L » Tue Nov 19, 2019 12:38 am

What is the lewis dot structure for a thiosulfate ion? I drew it with a Sulfur in the middle with double bonds to three oxygen and the other sulfur. This would give the central sulfur a -2 formal charge.

Dakota Walker 1L
Posts: 58
Joined: Wed Sep 18, 2019 12:17 am

Re: Thiosulfate Ion

Postby Dakota Walker 1L » Tue Nov 19, 2019 1:22 am

There should only be double bonds on 2 of the Oxygen atoms!

Aman Sankineni 2L
Posts: 103
Joined: Fri Aug 30, 2019 12:17 am

Re: Thiosulfate Ion

Postby Aman Sankineni 2L » Tue Nov 19, 2019 1:36 am

That would create a formal charge of -1 on both the single-bonded oxygen and sulfur. If you put double bonds on all of them, it would create a formal charge of -2 on the central sulfur. Isn't that identical in terms of formal charge?

JinwooLee_1F
Posts: 47
Joined: Sat Aug 17, 2019 12:15 am

Re: Thiosulfate Ion

Postby JinwooLee_1F » Tue Nov 19, 2019 1:48 am

You would want to have more charge on the atom with greater electronegativity. If S has formal charge of -2 and O has none, it would not be correct as O needs a negative formal charge (since it has greater electronegativity than S).

Aman Sankineni 2L
Posts: 103
Joined: Fri Aug 30, 2019 12:17 am

Re: Thiosulfate Ion

Postby Aman Sankineni 2L » Tue Nov 19, 2019 3:49 pm

If the formal charges should be on the atom with the greatest electronegativity, then shouldn't the double bonds be to one oxygen and one sulfur? Then the other two oxygen would both have a formal charge of -1.


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