Strong Acids - HClO4 and HClO3

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Dayna Pham 1I
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Strong Acids - HClO4 and HClO3

Postby Dayna Pham 1I » Sat Dec 08, 2018 1:30 am

Chlorate is ClO3 -1, and adding a Hydrogen would make it neutral, so I understand that HClO3 should be neutral.
Why is perchloric acid (HClO4) neutral and not negatively charged since there's another oxygen on it compared to neutral HClO3?

Gary Qiao 1D
Posts: 66
Joined: Fri Sep 28, 2018 12:26 am

Re: Strong Acids - HClO4 and HClO3

Postby Gary Qiao 1D » Sat Dec 08, 2018 1:56 am

HClO4 is still neutral because we can look at the formal charges in the Lewis structure to determine the charge of HClO4. The Cl atom would have three double bonds with three oxygen atoms and one single bond with OH, causing the formal charge of Cl to be 0 (7-(0+14/2)). All the oxygens will also have a formal charge of 0 because all of them will have two bonds, causing the overall HClO4 molecule to be neutral. The number of oxygens does not affect the overall charge, rather the bonds with the oxygens do.

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