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Thiosulfate Ion

Posted: Tue Nov 19, 2019 12:38 am
by Aman Sankineni 2L
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.

Re: Thiosulfate Ion

Posted: Tue Nov 19, 2019 1:22 am
by Dakota Walker 1L
There should only be double bonds on 2 of the Oxygen atoms!

Re: Thiosulfate Ion

Posted: Tue Nov 19, 2019 1:36 am
by Aman Sankineni 2L
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?

Re: Thiosulfate Ion

Posted: Tue Nov 19, 2019 1:48 am
by JinwooLee_1F
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).

Re: Thiosulfate Ion

Posted: Tue Nov 19, 2019 3:49 pm
by Aman Sankineni 2L
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.